Node removing in a Tree, for loop, and Enumeration

Hi there
it should be pretty easy, however i'm stuck with this code:
public void supprNode(DefaultMutableTreeNode node){
for(en = node.preorderEnumeration();e.hasMoreElements();){
DefaultMutableTreeNode tmpNode= (DefaultMutableTreeNode) en.nexElement();
if (tmpNode instanceof myderivedNodeClass)
tmpNode.doSomething();
if(!tmpNode.isRoot())
removeNodeFromParent(tmpNode);
}The problem is, the for loop doesn't traverse all the elements. That's if i call removeNodeFromParent. Is the enumeration updated twice?
ie if my tree is
root
-1
-2
-3after the call of supprNode(root) i get:
root
-2And i really don't understand why.

Hi!
If you look at the apidoc of DefaultMutableTreeNode.preorderEnumeration() you will see following text:
* Modifying the tree by inserting, removing, or moving a node invalidates
* any enumerations created before the modification.
So you should copy the elements of the enumeration in a separate list and iterate then over this list!
With kind regard,
Mathias

Similar Messages

[svn:fx-trunk] 12827: Removed the accessibility implementation for WindowAccImpl and WindowedApplicationAccImpl as they are likely not needed .

Revision: 12827
Revision: 12827
Author:   [email protected]
Date:     2009-12-10 19:03:29 -0800 (Thu, 10 Dec 2009)
Log Message:
Removed the accessibility implementation for WindowAccImpl and WindowedApplicationAccImpl as they are likely not needed. In their current form they were preventing the accessibility of child components from being exposed.
QE notes: none
Doc notes: none
Bugs: n/a
Reviewer: Gordon
Tests run: checkintests
Is noteworthy for integration: no
Removed Paths:
    flex/sdk/trunk/frameworks/projects/airspark/src/spark/accessibility/WindowAccImpl.as
    flex/sdk/trunk/frameworks/projects/airspark/src/spark/accessibility/WindowedApplicationAc cImpl.as

Remember that Arch Arm is a different distribution, but we try to bend the rules and provide limited support for them. This may or may not be unique to Arch Arm, so you might try asking on their forums as well.

Upgrading a 3-node Hyper-V clusters storage for £10k and getting the most bang for our money.

Hi all, looking for some discussion and advice on a few questions I have regarding storage for our next cluster upgrade cycle.
Our current system for a bit of background:
3x Clustered Hyper-V Servers running Server 2008 R2 (72TB Ram, dual cpu etc...)
1x Dell MD3220i iSCSI with dual 1GB connections to each server (24x 146GB 15k SAS drives in RAID 10) - Tier 1 storage
1x Dell MD1200 Expansion Array with 12x 2TB 7.2K drives in RAID 10 - Tier 2 storage, large vm's, files etc...
~25 VM's running all manner of workloads, SQL, Exchange, WSUS, Linux web servers etc....
1x DPM 2012 SP1 Backup server with its own storage.
Reasons for upgrading:
Storage though put is becoming an issue as we only get around 125MB/s over the dual 1GB iSCSI connections to each physical server. (tried everything under the sun to improve bandwidth but I suspect the MD3220i Raid is the bottleneck here.
Backup times for vm's (once every night) is now in the 5-6 hours range.
Storage performance during backups and large file syncronisations (DPM)
Tier 1 storage is running out of capacity and we would like to build in more IOPS for future expansion.
Tier 2 storage is massively underused (6tb of 12tb Raid 10 space)
Migrating to 10GB server links.
Total budget for the upgrade is in the region of £10k so I have to make sure we get absolutely the most bang for our buck.
Current Plan:
Upgrade the cluster to Server 2012 R2
Install a dual port 10GB NIC team in each server and virtualize cluster, live migration, vm and management traffic (with QoS of course)
Purchase a new JBOD SAS array and leverage the new Storage Spaces and SSD caching/tiering capabilities. Use our existing 2TB drives for capacity and purchase sufficient SSD's to replace the 15k SAS disks.
On to the questions:
Is it supported to use storage spaces directly connected to a Hyper-V cluster? I have seen that for our setup we are on the verge of requiring a separate SOFS for storage but the extra costs and complexity are out of our reach. (RDMA, extra 10GB NIC's
etc...)
When using a storage space in a cluster, I have seen various articles suggesting that each csv will be active/passive within the cluster. Causing redirected IO for all cluster nodes not currently active?
If CSV's are active/passive its suggested that you should have a csv for each node in your cluster? How in production do you balance vm's accross 3 CSV's without manually moving them to keep 1/3 of load on each csv? Ideally I would like just
a single CSV active/active for all vm's to sit on. (ease of management etc...)
If the CSV is active/active am I correct in assuming that DPM will backup vm's without causing any re-directed IO?
Will DPM backups of VM's be incremental in terms of data transferred from the cluster to the backup server?
Thanks in advance for anyone who can be bothered to read through all that and help me out! I'm sure there are more questions I've forgotten but those will certainly get us started.
Also lastly, does anyone else have a better suggestion for how we should proceed?
Thanks

Current Plan:
Upgrade the cluster to Server 2012 R2
Install a dual port 10GB NIC team in each server and virtualize cluster, live migration, vm and management traffic (with QoS of course)
Purchase a new JBOD SAS array and leverage the new Storage Spaces and SSD caching/tiering capabilities. Use our existing 2TB drives for capacity and purchase sufficient SSD's to replace the 15k SAS disks.
On to the questions:
Is it supported to use storage spaces directly connected to a Hyper-V cluster? I have seen that for our setup we are on the verge of requiring a separate SOFS for storage but the extra costs and complexity are out of our reach. (RDMA, extra 10GB NIC's
etc...)
When using a storage space in a cluster, I have seen various articles suggesting that each csv will be active/passive within the cluster. Causing redirected IO for all cluster nodes not currently active?
If CSV's are active/passive its suggested that you should have a csv for each node in your cluster? How in production do you balance vm's accross 3 CSV's without manually moving them to keep 1/3 of load on each csv? Ideally I would like just
a single CSV active/active for all vm's to sit on. (ease of management etc...)
If the CSV is active/active am I correct in assuming that DPM will backup vm's without causing any re-directed IO?
Will DPM backups of VM's be incremental in terms of data transferred from the cluster to the backup server?
Thanks in advance for anyone who can be bothered to read through all that and help me out! I'm sure there are more questions I've forgotten but those will certainly get us started.
Also lastly, does anyone else have a better suggestion for how we should proceed?
Thanks
1) You can use direct connection to SAS with a 3-node cluster of course (4-node, 5-node etc). Sure it would be much faster then running with an additional SoFS layer (with SAS fed directly to your Hyper-V cluster nodes all reads and writes would be local
travelling down the SAS fabric and with SoFS layer added you'll have the same amount of I/Os targeting SAS + Ethernet with its huge compared to SAS latency sitting in between a requestor and your data residing on SAS spindles, I/Os overwrapped into SMB-over-TCP-over-IP-over-Etherent
requests at the hypervisor-SoFS layers). Reason why SoFS is recommended - final SoFS-based solution would be cheaper as SAS-only is a pain to scale beyond basic 2-node configs. Instead of getting SAS switches, adding redundant SAS controllers to every hypervisor
node and / or looking for expensive multi-port SAS JBODs you'll have a pair (at least) of SoFS boxes doing a file level proxy in front of a SAS-controlled back end. So you'll compromise performance in favor of cost. See:
http://davidzi.com/windows-server-2012/hyper-v-and-scale-out-file-cluster-home-lab-design/
Used interconnect diagram within this design would actually scale beyond 2 hosts. But you'll have to get a SAS switch (actually at least two of them for redundancy as you don't want any component to become a single point of failure, don't you?)
2) With 2012 R2 all I/O from a multiple hypervisor nodes is done thru the storage fabric (in your case that's SAS) and only metadata updates would be done thru the coordinator node and using Ethernet connectivity. Redirected I/O would be used in a two cases
only a) no SAS connectivity from the hypervisor node (but Ethernet one is still present) and b) broken-by-implementation backup software would keep access to CSV using snapshot mechanism for too long. In a nutshell: you'll be fine :) See for references:
http://www.petri.co.il/redirected-io-windows-server-2012r2-cluster-shared-volumes.htm
http://www.aidanfinn.com/?p=12844
3) These are independent things. CSV is not active/passive (see 2) so basically with an interconnection design you'll be using there's virtually no point to having one-CSV-per-hypervisor. There are cases when you'd still probably do this. For example if
you'd have all-flash and combined spindle/flash LUNs and you know for sure you want some VMs to sit on flash and others (no so I/O hungry) to stay within "spinning rust". One more case is many-node cluster. With it multiple nodes basically fight for a single
LUN and a lot of time is wasted for SCSI reservation conflicts resove (ODX has no reservation offload like VAAI has so even if ODX is present its not going to help). Again it's a place where SoFS "helps" as having intermediate proxy level turns block I/O into
file I/O triggering SCSI reservation conflicts for a two SoFS nodes only instead of an evey node in a hypervisor cluster. One more good example is when you'll have a mix of a local I/O (SAS) and Ethernet with a Virtual SAN products. Virtual SAN runs directly
as part of the hypervisor and emulates high performance SAN using cheap DAS. To increase performance it DOES make sense to create a concept of a "local LUN" (and thus "local CSV") as reads targeting this LUN/CSV would be passed down the local storage
stack instead of hitting the wire (Ethernet) and going to partner hypervisor nodes to fetch the VM data. See:
http://www.starwindsoftware.com/starwind-native-san-on-two-physical-servers
http://www.starwindsoftware.com/sw-configuring-ha-shared-storage-on-scale-out-file-servers
(feeding basically DAS to Hyper-V and SoFS to avoid expensive SAS JBOD and SAS spindles). The same thing as VMware is doing with their VSAN on vSphere. But again that's NOT your case so it DOES NOT make sense to keep many CSVs with only 3 nodes present or
SoFS possibly used.
4) DPM is going to put your cluster in redirected mode for a very short period of time. Microsoft says NEVER. See:
http://technet.microsoft.com/en-us/library/hh758090.aspx
Direct and Redirect I/O
Each Hyper-V host has a direct path (direct I/O) to the CSV storage Logical Unit Number (LUN). However, in Windows Server 2008 R2 there are a couple of limitations:
For some actions, including DPM backup, the CSV coordinator takes control of the volume and uses redirected instead of direct I/O. With redirection, storage operations are no longer through a host’s direct SAN connection, but are instead routed
through the CSV coordinator. This has a direct impact on performance.
CSV backup is serialized, so that only one virtual machine on a CSV is backed up at a time.
In Windows Server 2012, these limitations were removed:
Redirection is no longer used.
CSV backup is now parallel and not serialized.
5) Yes, VSS and CBT would be used so data would be incremental after first initial "seed" backup. See:
http://technet.microsoft.com/en-us/library/ff399619.aspx
http://itsalllegit.wordpress.com/2013/08/05/dpm-2012-sp1-manually-copy-large-volume-to-secondary-dpm-server/
I'd look at some other options. There are few good discussion you may want to read. See:
http://arstechnica.com/civis/viewtopic.php?f=10&t=1209963
http://community.spiceworks.com/topic/316868-server-2012-2-node-cluster-without-san
Good luck :)
StarWind iSCSI SAN & NAS

For loop and xml - how to point the right content in a XML file with a dynamically created button?

Hi Everybody,
as my first experience in AS3 I'm bulding a photo multigallery. In that gallery I have some buttons, each one pointing to its respective set of images.
Each button is created with the for loop, that picks the information from a XML file. From this XML I get the text of the button, the position etc. What I did with some sucess. But there is a scary problem: I don't know how to make each button load the respective and unique set of images.
I've tryied several different methods, with no effect, to make each loop to give to each button an unique identity to load the respective set of images.
I imagine that the solution pass by the use of arrays. I wrote some code, and I guess that I'm almost there (but not sure). Here is my AS3 code until now:
// CREATE MENU CONTAINER //
var menuContainer:MovieClip = new MovieClip();
menuContainer.x=10;
menuContainer.y=300;
addChild(menuContainer);
// CREATE IMAGES CONTAINER //
var imagesContainer:MovieClip = new MovieClip();
imagesContainer.x=10;
imagesContainer.y=10;
addChild(imagesContainer);
//// LOAD XML ////
var xmlLoader:URLLoader = new URLLoader();
xmlLoader.addEventListener(Event.COMPLETE, whenLoaded);
xmlLoader.load(new URLRequest("XML/roiaXML.xml"));
var xml:XML;
function whenLoaded(evt:Event):void {
     xml=new XML(evt.target.data);
     var mySetsList:XMLList=xml.children();
     //// MENU BUTTONS ////
     // CREATE ARRAYS //
     var totalArray:Array = new Array();
     var setNodesArray:Array = new Array();
     var setNamesArray:Array = new Array();
     // POSITIONING BUTTONS INSIDE MENU CONTAINER//
     var rowsQuantity:Number=3;
     var columnsQuantity:Number=Math.ceil(mySetsList.length()/rowsQuantity);
     var cellWidth:Number=160;
     // CREATE BUTTONS //
     for (var i:int=0; i< mySetsList.length(); i++) {
          var newSetButtonMC:setButtonMC=new setButtonMC();
          //what do I do here to make it works? To give each button created a unique id.
          setNodesArray.push(i);
          //trace(setNodesArray);
          var imageNodesArray:Array = new Array();
          for (var j:int=0; j<mySetsList[i].IMAGE.length(); j++) {
               imageNodesArray.push(mySetsList[i].IMAGE[j].attribute("imageTitle"));
          totalArray.push(imageNodesArray);
          newSetButtonMC.setButtonText.text=mySetsList.attribute("galeriaTitle")[i];
          newSetButtonMC.setButtonText.autoSize=TextFieldAutoSize.LEFT;
          var cellX:Number=Math.floor(i/rowsQuantity);
          var cellY:Number=i%rowsQuantity;
          newSetButtonMC.x=cellX*cellWidth;
          newSetButtonMC.y=cellY*(newSetButtonMC.height+10);
          newSetButtonMC.addEventListener(MouseEvent.CLICK, onClick);
          menuContainer.addChild(newSetButtonMC);
     totalArray.push(setNodesArray);
     //// MENU BUTTONS ACTIONS ////
     function onClick(mevt:MouseEvent):void {
          trace(totalArray [0][0]);
          trace(totalArray [0][0]);
          // in the line above I achieved some success loading a specific info from XML.
          // but I don't know what to do with it.
          //what do I do here? To make each button to load its own node from XML.
Here is my XML:
<GALERIA galeriaTitle="galeria 01">
<IMAGE imageTitle="imageTitle01">feio.jpg</IMAGE>
<IMAGE imageTitle="imageTitle02">muitofeio.jpg</IMAGE>
<IMAGE imageTitle="imageTitle03">aindamaisfeio.jpg</IMAGE>
</GALERIA>
<GALERIA galeriaTitle="galeria 02">
<IMAGE imageTitle="imageTitle01">estranho.jpg</IMAGE>
<IMAGE imageTitle="imageTitle02">maisestranho.jpg</IMAGE>
<IMAGE imageTitle="imageTitle03">aindamaisestranho.jpg</IMAGE>
</GALERIA>
Thanks everyone . ABSTRATO

you can assign each newSetButtonMC and ivar property that points to its i value or, even easier:
// CREATE MENU CONTAINER //
var menuContainer:MovieClip = new MovieClip();
menuContainer.x=10;
menuContainer.y=300;
addChild(menuContainer);
// CREATE IMAGES CONTAINER //
var imagesContainer:MovieClip = new MovieClip();
imagesContainer.x=10;
imagesContainer.y=10;
addChild(imagesContainer);
//// LOAD XML ////
var xmlLoader:URLLoader = new URLLoader();
xmlLoader.addEventListener(Event.COMPLETE, whenLoaded);
xmlLoader.load(new URLRequest("XML/roiaXML.xml"));
var xml:XML;
function whenLoaded(evt:Event):void {
     xml=new XML(evt.target.data);
     var mySetsList:XMLList=xml.children();
     //// MENU BUTTONS ////
     // CREATE ARRAYS //
     var totalArray:Array = new Array();
     var setNodesArray:Array = new Array();
     var setNamesArray:Array = new Array();
     // POSITIONING BUTTONS INSIDE MENU CONTAINER//
     var rowsQuantity:Number=3;
     var columnsQuantity:Number=Math.ceil(mySetsList.length()/rowsQuantity);
     var cellWidth:Number=160;
     // CREATE BUTTONS //
     for (var i:int=0; i< mySetsList.length(); i++) {
          var newSetButtonMC:setButtonMC=new setButtonMC();
          //what do I do here to make it works? To give each button created a unique id.
          setNodesArray.push(i);
          //trace(setNodesArray);
          var imageNodesArray:Array = new Array();
          for (var j:int=0; j<mySetsList[i].IMAGE.length(); j++) {
               imageNodesArray.push(mySetsList[i].IMAGE[j].attribute("imageTitle"));
         nextSetButtonMC.imageArray = imageNodesArray;
          //totalArray.push(imageNodesArray);
          newSetButtonMC.setButtonText.text=mySetsList.attribute("galeriaTitle")[i];
          newSetButtonMC.setButtonText.autoSize=TextFieldAutoSize.LEFT;
          var cellX:Number=Math.floor(i/rowsQuantity);
          var cellY:Number=i%rowsQuantity;
          newSetButtonMC.x=cellX*cellWidth;
          newSetButtonMC.y=cellY*(newSetButtonMC.height+10);
          newSetButtonMC.addEventListener(MouseEvent.CLICK, onClick);
          menuContainer.addChild(newSetButtonMC);
     totalArray.push(setNodesArray);
     //// MENU BUTTONS ACTIONS ////
     function onClick(mevt:MouseEvent):void {
          var mc:setButtonMC=setButtonMC(mevt.currentTarget);
for(i=0;i<mc.imageArray.length;i++){
trace(mc.imageArray[i]);
Here is my XML:
<GALERIA galeriaTitle="galeria 01">
<IMAGE imageTitle="imageTitle01">feio.jpg</IMAGE>
<IMAGE imageTitle="imageTitle02">muitofeio.jpg</IMAGE>
<IMAGE imageTitle="imageTitle03">aindamaisfeio.jpg</IMAGE>
</GALERIA>
<GALERIA galeriaTitle="galeria 02">
<IMAGE imageTitle="imageTitle01">estranho.jpg</IMAGE>
<IMAGE imageTitle="imageTitle02">maisestranho.jpg</IMAGE>
<IMAGE imageTitle="imageTitle03">aindamaisestranho.jpg</IMAGE>
</GALERIA>
Thanks everyone . ABSTRATO

For Loop and Void Method Questions

Question 1: How would I write a for loop that repeats the according to the number entered, to prompt the user to enter a number (double) between 1 and 100. If the number is outside this range it is not accepted.
Question: 2 Also how would I write a for loop to do sum and find the average of the array numbers in a seperate void method( does not return anything to the main method)?
Question: 3 (first code snippet) With my for loop that is used to process each number in the array and square it and cube it and display the results to 2 decimal places. How do I make it so say I want the array to allow me to enter 2 numbers (so I enter 2 numbers) then it asks me to enter a number between 1 -100 (which will prompt 2 times) that it shows me the results for the entered numbers between 1-100 after one another instead of number then result number then result like I how it now.
for (int index = 0; index < howNum; index++) // process each number in the array
          enterYourNumbers = JOptionPane.showInputDialog
                        ("Enter a number between 1 and 100");
          numArray = new double[howNum];
        try
            numArray[index] = Double.parseDouble(enterYourNumbers);
        catch (NumberFormatException e)
                enterYourNumbers = JOptionPane.showInputDialog
                          ("Enter a number between 1 and 100");
            DecimalFormat fmt = new DecimalFormat ("###,###.00");
            JOptionPane.showMessageDialog(null, enterYourNumbers + " " + "squared is " + fmt.format(calcSquare(numArray[index]))
                                          + "\n" + enterYourNumbers + " " + "cubed is " + fmt.format(calcCube(numArray[index])));
            wantToContinue = JOptionPane.showInputDialog ("Do you want to continue(y/n)? ");
while (wantToContinue.equalsIgnoreCase("y"));
import javax.swing.*;
import java.text.DecimalFormat;
public class Array
    public static void main(String[] args)
        int howNum = 0;
        int whichNum = 0;
        double[] numArray;
        boolean invalidInput = true;
        String howManyNumbers, enterYourNumbers, wantToContinue;
do // repeat program while "y"
      do // repeat if invalid input
        howManyNumbers = JOptionPane.showInputDialog
                    ("How many numbers do you want to enter");
        try
             howNum = Integer.parseInt(howManyNumbers);
             invalidInput = false;
        catch (NumberFormatException e )
            howManyNumbers = JOptionPane.showInputDialog
                        ("How many numbers do you want to enter");
      while (invalidInput);
      for (int index = 0; index < howNum; index++) // process each number in the array
          enterYourNumbers = JOptionPane.showInputDialog
                        ("Enter a number between 1 and 100");
          numArray = new double[howNum];
        try
            numArray[index] = Double.parseDouble(enterYourNumbers);
        catch (NumberFormatException e)
                enterYourNumbers = JOptionPane.showInputDialog
                          ("Enter a number between 1 and 100");
            DecimalFormat fmt = new DecimalFormat ("###,###.00");
            JOptionPane.showMessageDialog(null, enterYourNumbers + " " + "squared is " + fmt.format(calcSquare(numArray[index]))
                                          + "\n" + enterYourNumbers + " " + "cubed is " + fmt.format(calcCube(numArray[index])));
            wantToContinue = JOptionPane.showInputDialog ("Do you want to continue(y/n)? ");
while (wantToContinue.equalsIgnoreCase("y"));
    public static double calcSquare(double yourNumberSquared)
        return yourNumberSquared * yourNumberSquared;
    public static double calcCube(double yourNumberCubed)
       return yourNumberCubed * yourNumberCubed * yourNumberCubed;
    public static void calcAverage(double yourNumberAverage)
}

DeafBox wrote:
Question 1: How would I write a for loop that repeats the according to the number entered, to prompt the user to enter a number (double) between 1 and 100. If the number is outside this range it is not accepted. Use a while loop instead.
Question: 2 Also how would I write a for loop to do sum and find the average of the array numbers in a seperate void method( does not return anything to the main method)? Why would you want to use 2 methods. Use the loop to sum the numbers. Then after the loop a single line of code calculates the average.
Question: 3 (first code snippet) With my for loop that is used to process each number in the array and square it and cube it and display the results to 2 decimal places. How do I make it so say I want the array to allow me to enter 2 numbers (so I enter 2 numbers) then it asks me to enter a number between 1 -100 (which will prompt 2 times) that it shows me the results for the entered numbers between 1-100 after one another instead of number then result number then result like I how it now. If I understand you correctly, use 2 loops. One gathers user inputs and stores them in an array/List. The second loop iterates over the array/List and does calculations.

How to code a parallel 'for loop' and 'while loop' where the while loop cannot terminate until the for loop has finished?? (queues also present)

I've attached a sample VI that I just cannot figure out how to get working the way that I want. I've labeled the some sections with black-on-yellow text boxes for clarity during the description that follows in the next few sentences. Here's what I want:
1) overall -- i'm intend for this to be a subVI that will do data acquisition and write the data to a file. I want it to use a producer/consumer approach. The producer construct is the 'parallel for loop' that runs an exact number of times depending on user input (which will come from the mainVI that is not included). For now I've wired a 1-D array w/ 2 elements as a test case. During the producer loop, the data is acquired and put into a queue to be delt with in the consumer loop (for now, i just add a random number to the queue).
2) the consumer construct is the 'parallel while loop'. It will dequeue elements and write them to a file. I want this to keep running continuously and parallel until two conditions are met.
      i. the for loop has finished execution
      ii. the queue is empty.
   when the conditions are met, the while loop will exit, close the queue, and the subVI will finish. (and return stuff to mainVI that i can deal with on my own)
Here's the problems.
1) in the "parallel for loop" I have a flat sequence structure.. I haven't had time to incorporate some data dependency into these two sequential sections, but basically, I just care that the "inner while loop" condition is met before the data is collected and queued. I think I can do this on my own, but if you have suggestions, I'm interested.
2) I can easily get the outer for and while loops to run sequentially, but I want them to run in parallel. My reasoning for this is that that I anticipate the two tasks taking very different amounts of time. .. basically, I want the while loop to just keep polling the queue to get everything out of it (or I suppose I could somehow use notifiers - suggestions welcome)... the thing is, this loop will probably run faster than the for loop, so just checking to see that the queue is empty will not work... I need to meet the additional condition that nothing else will be placed in the queue - and this condition is met when the for loop is complete. basically, I just can't figure out how to do this.
3) for now, I've placed a simple stop button in the 'parallel while loop', but I must be missing something fundamental here, because the stop button is totally unresponsive. i.e. - when I press it, it stays depressed, and nothing happens.
suggestions are totally welcome!
thanks,
-Z
Attachments:
daq01v1.vi ‏59 KB

I'd actually like to add a little more, since I thought about it a bit and I'm still not quite certain I understand the sequence of events...
altenbach wrote:
zskillz wrote:
So i read a bit more about the 'dequeue element' function, and as I understand it, since there is no timeout wired to the dequeue element function, it will wait forever, thus the race condition I suggested above can never happen!
Yes, you got it!
As I've thought about it a bit more, there's a few things that surprise me... first, the reason the 'dequeue element while loop' errors is not because there's nothing in the queue, it's becaues the queue has been released and it's trying to access that released queue... However the problem I have is this --- Even though there's no timeout wired to the dequeue element, I still would think that the while loop that contains it would continue to run at whatever pace it wanted -- and as i said before.. most of the time, it would find that there is nothing to dequeue, but once in a while, something is there. however, it seems that this loop only runs when something has been enqueued. the reason I say this is illustrated in the next code sample MODv2 that's attached below. I've added a stop button to the "queue size while loop" so the program runs until that is pressed. I've also added a simple conditional in the "dequeue while loop" that generates a random number if it a button is pressed... but this button is totally non-responsive... which means to me that the "dequeue while loop" isn't actually continuously running, but only when an element is added to the queue. this still seems almost like the 'dequeue while loop" waits for a notifier from the queue telling it to run. can you explain this to me? because it is different from what I expect to be happening.
rasputin wrote:
I tried to open your VIs but it doesn't work. LV
is launched, the dialog box (new, open, configure...) opens and then...
nothing. Not even an error message. I guess it isn't a problem of LV
version or a dialog box would appear saying this. Could you, please,
send a image of the code?
Thanks,
Hi Rasputin, I'm using LV8. I assume that was your problem, but who knows. I've attached a pic of of altenbach's solution since it's what I needed.
thanks
-Z
Message Edited by zskillz on 10-20-2006 11:49 AM
Attachments:
daq01v1MODv2.vi ‏63 KB
daq01v1MODpic.JPG ‏116 KB

Best fit lines for loops and sine waves

I am trying to find a best fit line that will work for sine waves and loops (hysteresis loops). I can get the sine wave just fine, but when I switch to a hysteresis it just puts a line across the middle (I assume because of the 2 y values for every x). I am doing data acquisition that will take in both forms and graph them. I tried a polynomial fit and it doesn't work at least the way I implemented it and I tried a few others but it looks like they are all function based. Also, my y values are coming out of a Bessel filter. I don't think this would be affecting anything but I thought I would put it in here incase it does.
Did I miss one that I haven't tried that works for my application?
Thanks
Patrick

RiversDaddy wrote:
... currently I am doing it by looping and reducing the error towards zero to fit the amplitude and phase. (I know the frequency). If this is what you are looking to do then I will help, or should I be doing things differently? All of the functions I have found to filter or extract tones seem to introduce a larger frequency of phase error than i get using this method, but am I missing something?
"looping" is a bit vague. What is the actual algorithm to find better estimates (e.g. levenberg marquardt, etc.)
What problems did you have with extract single tone. Can you show some data where the results from it are not good?
LabVIEW Champion . Do more with less code and in less time .

I need to take elements from within 2 nested for loops and place them in an array at the specific row and column that I need.

I have tried intializing an array and replacing elements by specifying a particular row, and column, but in the end I get an array with only one element replaced, and I suspect that it is because as the for loops are running through their iterations each time the array is re-initializing. I have a simple vi that I will post below, it is not the exact situation that I have but is a good place for me to get some understanding. I have the row and column indexes being driven by the inner and outer loop iterations, which gives me the pattern I need. I am using the inner iterations as array elements. How do I set this up so that it works and d
oes keep re-initializing my array.
Attachments:
Untitled.vi ‏26 KB

I have fixed a number of things in your vi.
You were right in thinking that the array was continuously re-initialized. To avoid this, use a shift register (right-click the loop border), which will pass the updated array into the next iteration.
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
your_vi.vi.zip ‏13 KB

Creating a function with a for loop and %type

Hello,
I am trying to create a function which contains a for loop as well as %type.
This function is on a student table and i am trying to create a function which will display the zip which is a varchar2(5).
I need to do this through this function.
However, I can't seem to get it running.
Can anyone help?
below is what i tried as well as other options and was not successful.
I also displayed my error with the show error command.
SQL> create or replace function zip_exist
2 return varchar2
3 is
4 v_zip student.zip%TYPE;
5 cursor c_zip is
6 select zip
7 from
8 student
9 where zip=zip;
10 begin
11 open c_zip;
12 v_zip IN c_zip
13 loop
14 v_zip:=c_zip%TYPE;
15 end loop;
16 close c_zip;
17 end;
18 /
Warning: Function created with compilation errors.
SQL> show error
Errors for FUNCTION ZIP_EXIST:
LINE/COL ERROR
12/7 PLS-00103: Encountered the symbol "IN" when expecting one of the
following:
:= . ( @ % ;
16/1 PLS-00103: Encountered the symbol "CLOSE"
SQL>
kabrajo

user10873577 wrote:
Hello,
I am trying to create a function which contains a for loop as well as %type.
This function is on a student table and i am trying to create a function which will display the zip which is a varchar2(5).
I need to do this through this function.
However, I can't seem to get it running.
Can anyone help?
below is what i tried as well as other options and was not successful.
I also displayed my error with the show error command.
SQL> create or replace function zip_exist
2 return varchar2
3 is
4 v_zip student.zip%TYPE;
5 cursor c_zip is
6 select zip
7 from
8 student
9 where zip=zip;
10 begin
11 open c_zip;
12 v_zip IN c_zip
13 loop
14 v_zip:=c_zip%TYPE;
15 end loop;
16 close c_zip;
17 end;
18 /
Warning: Function created with compilation errors.
SQL> show error
Errors for FUNCTION ZIP_EXIST:
LINE/COL ERROR
12/7 PLS-00103: Encountered the symbol "IN" when expecting one of the
following:
:= . ( @ % ;
16/1 PLS-00103: Encountered the symbol "CLOSE"
SQL>
kabrajoTry This
Create a sample table
SQL> create table student(id number(10),zip varchar2(5));
Table created.Insert the record
SQL> insert into student values(1111,'A5454');
1 row created.
SQL> commit;
Commit complete.
SQL> select * from student;
        ID ZIP
      1111 A5454
SQL> create or replace function zip_exist(v_id number)
2   return varchar2
3   is
4   v_zip student.zip%TYPE;
5 BEGIN
6   select zip
7   INTO v_zip
8   FROM student
9   where id=v_id;
10   Return v_zip;
11 EXCEPTION WHEN NO_DATA_FOUND THEN
12                  RETURN 'INVALD';
13 WHEN OTHERS THEN
14                 return 'NA!';
15   end;
16 /
Function created.
SQL> set serveroutput on
SQL> select zip_exist(1111) from dual;
ZIP_EXIST(1111)
A5454
SQL> select zip_exist(2222) from dual;
ZIP_EXIST(2222)
INVALDHope this helps
Regards,
Achyut K

Please help with the FOR loop and the array..

I was trying to place some words in the Movie Clip
"TextPanel" and set a
random position to each of them.
But it's not working.
1) I created a Movie Clip "word" and inside that MC I created
a text field
and gave it an identifier "textFiled".
2) The linkage name for Movie Clip "word" I set to "word".
3) In the actionscript I created an Array called "aWords".
4) Then I created a FOR loop that should
place (attach) Movie Clips "word0", "word1", "word2" and
"word3" to the
movie clip TextPanel, and set the textField text for each of
them to the
text from the Array.
But the script attaches 4 Movie Clips with a name
"Undefined", instead of 4
different names (from the Array).
What is wrong with this script?
var aWords:Array = [apple,banana,orange,mango];
for(i=0;i<aWords.length;i++){
var v = TextPanel.attachMovie("word","word"+i,i);
v.textFiled.text = aWords
v._x = randomNumber(0,Stage.width);
v._y = randomNumber(0,Stage.height);
Thanks in advance

But in my Post I already wrote v.textFiled.text = aWords
so I don't understand what were you correcting..
And one more:
I have tested it by changing the
v.textFiled.text = aWords; to v.textFiled.text = "some
word";
and it's working fine.
So there is something wrong with the Array element, and I
don't know why..
"aniebel" <[email protected]> wrote in
message
news:ft2d5k$lld$[email protected]..
> Change:
> v.textFiled.text = aWords;
>
> to:
> v.textFiled.text = aWords
>
> It needs to know which element inside the array you want
to place in the
> textfield (or textfiled) :)
>
> If that doesn't work, double check that your instance
name is correct
> inside
> of "word".
>

Help with a FOR loop and an object array

I need to make a for loop that takes an array of objects that contain the parameters year, type, and model (all ints) and sort by year, then divide the array in all the objects with the same year and sort them by type, then divide the array again into the objects with the same year AND type and sort them by model.
the object a Dress objects, the get methods are get+nameof parameter.
the array is a 1D array called Dresses.
I have made a paralell array to store the value of the parameters and sort that then move the array acording to that sorted array. The problem is in the division of the array.

We'll give your request to do (or finish) your homework for you the attention it deserves.

I'm having problems manipulating array data within a for loop, and extracting the required sub-arrays generated.

Hi,
I'm using labVIEW V5.1
I'm trying to generate 10 1D arrays, the first array is initialized to all zeroes, then I have set up a for loop which shifts the first element by 1, then a random number is placed into the first element position. I am using a shift register to feed back in the newly generated array into the start of the loop.
By the end of the each loop I want to be able to use the array generated in an algorithm outside the loop. However I only want the Nx1 array that has just been generated.
Unfortunately, I cannot figure out how to resize, reshape or index the output array to do this.
I would like the loop to
give me out a 1D array after each iteration.
Any help would be greatly appreciated.

I hope I've understood your problem.
First your vi was lacking of the sub-vi working as shift register, I've replaced it with the rotate function.
The indexing of your arrays create a 2D array whose rows are your 1D array.To pick only one of them you have to use the index array function and select which one you want.
To use your temporary data in another part of your application you should use a local variable of array2.
I did it in a separated while loop That I syncronized with the for loop using occurrence, in this way the while loop runs each time a new value is inserted in array2 (each loop of the for loop structure).
If you don't need this syncronization just get rid of occurrence functions.
I place a delay in the for loop to show what happens when running.
Hope it was helpful.
Alberto Locatelli
Attachments:
array_test_v3.vi ‏35 KB

Event structure in "for loop" and stacked sequence

I tried to put an event structure into a for loop sequence, then used a pause button to pause the program (one loop with event structure.vi). The pause button functioned normally since the program could be paused whenever the button was pressed. Then, I put this for loop sequence into a stacked sequence (Problem.vi), which has 2 frames and every frame has the for loop sequence in it. After the pause button was pressed once, the pause button and stop button will no longer effective anymore. Where should I modify so that this program will work properly? Thanks a lot.
Attachments:
Problem.vi ‏42 KB
one_loop_with_event_structure.vi ‏27 KB

Ah, at last something weird !
The answer is simple : don't do that !
You should either avoid having 2 event structures handling the same events, or learn how to process dynamic events.
Why didn't you read the answers to a question posted a few hours ago (still on the overview page of this forum ?). See here.
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Handle Error in for Loop and finish the iteration

I am using a for Loop now i encounter an error.
i want to handle this error but after that carry on with iteration of the loop.
Any Parallel to "Continue" in JAVA or any other solution for this...
Please Suggest.

You can use pl/sql block with exception inside the loop
Re: Continue beyond expcetion in proc...
Message was edited by:
jeneesh

Drawing a Christmas tree w/ nested for loops and from JavaScript to Java

I need help in making this code compatible with Java (I use BlueJ):
It's JavaScript...
Thanks in advance!
<HTML>
<BODY>
<CENTER>
<SCRIPT>
var width=1;
for (i=0; i <= 5 ; i++)
for (x=0; x<=4; x++)
for (y=1; y<=width; y++)
var Number=Math.random()*10;
var Ornament=Math.round(Number);
if (Ornament<=1)
document.write("O");
if (Ornament>=2)
document.write(" X");
document.write("<BR>");
width=width+1;
width=width-2;
</SCRIPT>
</CENTER>
</BODY>
</HTML>

What do you mean "compatible with Java"? Java doesn't enter into this at all.
Are you asking how to translate this code to Java?
If so, where you have "<BR>", you'll want a println rather than a print (as in System.out.print).
The second tricky part is centering. The browser handled that for you here.
You'll have to either do it yourself, or find another Java API tool to do it for you.
If I were you I'd look at the API docs for PrintStream.format(), I think it is. It's possible that the %s conversion has a "center" option. Or maybe something else there does.
If there is no textual centering tool, you can build one yourself by using StringBuffer or StringBuilder and padding with spaces, I guess.
Otherwise it should map across pretty easily.

Node removing in a Tree, for loop, and Enumeration

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