Deleting elements from Arrays.

Hello,
I have to be able in this latest exercise to delete an element from an Array. I was wondering if you could give me code examples on how to do this. I am pretty sure that you have to read through the array and return "null" when you hit the element that you want to delete in the array.
Thank you.

Look through the forum. There are at least two other threads open with people asking the same question.

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How to delete elements from a cluster?

Hello. I would like to know how to delete elements from a cluster. I got stuck with this problem. There is its own order of each element in a cluster. I tried to initiate an array but it seems like too complicated. In the attached file, I want to obtain only the data from "flow" not "pressure". I try to use array programming but it doesn't work. Would be nice if you help me to fix the file. Thanks
Solved!
Go to Solution.
Attachments:
test 1.vi ‏16 KB

Bombbooo wrote:
What about if I want to store data into the pressure array too? Do I have to create another loop or it can be done in the same loop as the flow loop?
Try this, for example. Modify as needed.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
test1MOD2.vi ‏9 KB
SelectFlowOrPressure.png ‏7 KB

Add/Delete elements from viewcontaineruielement in web dynpro abap

Dear all,
Please let me know how to Add/Delete elements from viewcontaineruielement in web dynpro abap? I have copied a viewcontaineruielement from another program and now i dont want few elements from that viewcontaineruielement in my view. Please guide

Hi Ajinkya,
I have copied a viewcontaineruielement from another program and now i dont want few elements from that viewcontaineruielement in my view. Please guide
Have you saved that VC element as template and using that template in another component?.If so,on resuing that VC element template it populates all the screen elements which you've save as template.
Now, select that VC element which you've re-used,based on you're requirement add/remove UI elements as Kiran suggested.
Hope it will resolve your issue.
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Problems selecting elements from arrays

I'm having difficulty selecting indexed elements from a array of nodes. I have seen this issues discussed in a number of threads but none address the specific issue which I have encountered.
Previously in version 10.1.2 I constructed a XPath query and then used the BPEL getVariableData function to obtain the element I was after but this doesn't appear to be supported the same way in 10.1.3.1.
I'm using the following expression
bpws:getVariableData('VariableDBResult',bpws:getVariableData('xpath'))
and when I try to compile I get the following error
Error(243):
[Error ORABPEL-10085]: invalid argument
[Description]: in line 243 of "C:\....", the second argument "bpws:getVariableData("xpath")" for getVariableData is not a literal expression.
[Potential fix]: Please correct the second argument, you might need to escape using single quote or " to make it literal.
I used the same code in 10.1.2 and it compiled fine.
For reference the XPath is formed as follows
concat('/ns3:Result/ns3:t/ns3:c/ns3:e[',bpws:getVariableData('loop'),']')
But the error occurs at compile time not run time so I suspect the way the xpath is formed would not affect the compile
I'm suspecting the problem has something to do with the fact that I'm using the function without the optional "pat name" the variable "VariableDBResult" is defined by a schema not a WSDL message type. I have compiled the Array sample 112 which used a part name and it works but in my case without the part name it fails.
I attempted to cast the expression to a string and use a string variable, all to no avail.
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Regards
Graeme

Has anybody got around this issue...I searched the forums but allI could get it unresolved threads pointing to this problem
getVariableData is not a literal expression
Re: getVariableData is not a literal expression
Literal function error
Literal function error
I want to mention that its a compile time issue and I am using Jdev 10.1.3.4

Remove element from array

hi
if i have an array
eg
int[] array = {4,2,1,2,1};
how to i remove the index 2 from it and create a new array?
thanks

You can't remove the element--an array's size is fixed at creation.
If you want a new array, create a new one that's one element smaller, then use System.arrayCopy to copy the elements you want to keep.

Delete rows from array within limits

Hello,
I am attempting to delete the rows that are a multiples of the fundamental entry. However, the multiples of the fundamental are not always an exact multiple, they can differ by up to 3M. So, from the origial array,:
130.4M -65.386
149.4M 9.6346
172.2M -64.981
301.4M -17.273
426.8M -68.169
449.6M -820.72m
472.4M -66.132...
with the multiples of 149.4M deleted, the output array should be:
130.4M -65.386
172.2M-64.981
426.8M -98.169
472.4M -66.132...
Any help will be greatly appreciated!
Thanks,
hiNi.
Attachments:
delete rows 2.vi ‏13 KB

This?
"In theory, theory and practice are the same. In practice, they’re not."
Attachments:
Solved.vi ‏11 KB

Delete rows from array

Hello,
I am attempting to delete the rows that contain a multiple of the x-data from the original array and have the output array show the original array minus the delete harmonics array.
Original array:
100 3
200 18
300 13
400 8
500 0
600 0
700 0
delete rows that contain multiples of 300. Output array will be
100 3
200 18
400 8
500 0
700 0
Any help will be sincerely appreciated.
Thanks,
hiNi.
Solved!
Go to Solution.
Attachments:
delete rows.vi ‏14 KB

Hello,
I wanted to further expand on this program as follows:
I wanted to delete the rows that are a multiples of the fundamental entry. However, the multiples of the fundamental are not always an exact multiple, they can differ by up to 3M. So, from the origial array,:
130.4M -65.386
149.4M 9.6346
172.2M -64.981
301.4M -17.273
426.8M -68.169
449.6M -820.72m
472.4M -66.132...
with the multiples of 149.4M deleted, the output array should be:
130.4M -65.386
172.2M-64.981
426.8M -98.169
472.4M -66.132...
Any help will be greatly appreciated!
Thanks,
hiNi.
Attachments:
delete rows 2.vi ‏13 KB

Delete elements from XML file using DOM and java

Hi
I want now is to remove element from my XML file
for example
i have following xml
<?xml version="1.0" encoding="UTF-8"?>
<printing>
<firstLineTexts>
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          <firstLineText>|line12</firstLineText>
</firstLineTexts>
</printing>how do i remove all elements fireLineText
my final output should be
<?xml version="1.0" encoding="UTF-8"?>
<printing>
<firstLineTexts>
</firstLineTexts>
</printing>How do i do it using DOM,
I can create instance of DOM and write it using TransformerFactory
Ashish

Hi
I am trying the following code,
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Delete element from a collection (JDev 10.1.2)

Hello
I have a bean which has a collection "testCollection" and accessors for it. This has been populated with some elements (similar to the LDAPDataControls example). I have created the data control for it and dragged the collection onto a JSP as a read only form. This displays the current element of the collection depending on the iterator position.
I then have a forward on the page using a button to a Data Action called RemoveAction. I have overwritten invokeCustomMethod and I'm trying to remove the element in the collection at the current iteraotr position.
I can access the iterator using actionContext.getBindingContainer().findIterator("testCollectionIterator");
From this I can get the current row but both row.remove() and row.removeFromCollection throw UnsupportedMethod exceptions.
I can access the collection using actionBinding.getBindingContainer().getDataControl().getDataProvider(), but I have no way of removing the object from the collection without having a reference to the object itself.
Please can someone explain how to remove elements from the collection?
Also can someone explain in the LDAPDataControls example why its also necessary to have a class called LDAPDataControl (type of DCGenericDataControl) and a LDAPDataControlFactory (type of DataControlFactoryImpl)?
Just having the classes LDAPSearch, the bean class LDAPEntry, and a class to hold the collection LDAPCollection works fine. Create the data control for LDAPCollection and drag the collection onto the JSP.
Thanks.

I'm still not sure about this. Can anyone help? Thanks.

Deleting element from binary search tree

please could u tell me what is the wrong with this deleting function ..
     private BTNode deleteElement(int a,BTNode curNode)
          BTNode s,q,p;
          if (curNode==null)
          return curNode;
          HasId curObject =(HasId)curNode.getInfo();
          if (a>curObject.getId())
           curNode=deleteElement(a,curNode.getRight());
           return curNode;
          else if (a<curObject.getId())
               curNode=deleteElement(a,curNode.getLeft());
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          else
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               s=curNode;
               if (q.getRight()==null)
               curNode=q.getLeft();
               else if (q.getLeft()==null)
               curNode=q.getRight();
                    else{
               p=q.getRight();
               while (p.getLeft()!=null)
                    s=p;
                    p=p.getLeft();
               curNode=p;
               curNode.setLeft(q.getLeft());
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Very confusing code for the case a == curObjec.getId()
Try giving meaningful names to the nodes instead of p, q, r, and adding some comments. It also looks like you could do with less node references than curnode, p, q and r, you are throwing them around a lot which is quite confusing.
I find he following a bit weird:
while (p.getLeft()!=null)
                    s=p;
                    p=p.getLeft();
               }I don't know why you are making a path that always goes to the left child node while you already found a node to be deleted. Also I would think that a binary tree should be symmetric, so why only go to the left?
If you got the delete algorithm from a book or website try to look exactly where your code goes wrong. Otherwise try running your code in your mind on a simple example tree and see if you find an error.

Deleting all elements from array and array to spreadsheet string

Hello,
I would like to write a new data file for each "recording" session without closing the VI. My problem is that the last "recording" session's data is at the top of every successive session's text file. I do not want this. I've tried to delete all rows from the array after my array to spreadsheet string function, but I think the problem is somewhere with the shift register and how the array is built. I'm not too familiar with LabView and this aspect of my interface is driving me crazy. Attached is my code and two successive data files. I have not been able to find a solution on these or the LAVA forums. Any help would be appreciated.
Also, I know there is an easier way to write this kind of streaming data, but I need to do it this way for other devices and synchronization purposes.
Attachments:
testsecond.txt ‏90 KB
test41.vi ‏80 KB
testfirst.txt ‏78 KB

A few more comments to your code:
Your loop does not have a wait, meaning it spins the empty case millions if times per second, consuming all CPU while not doing anything. Add an indicator to [i] to see.
To clear a 2D array in one case frame, just don't wire the output tunnel and set it to "use default if unwired". You'll get an empty array. No fancy tools needed.
I probably would use an event structure and also protect the data if the save dialog is canceled.
Here's a simple draft that probably requires a bit more work but should show some of the ideas.
You should also
add some protection that the VI cannot consume all available memory if it runs forever.
Create a seperate case to save the data later if the file dialog is cancelled the first time.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
test41MOD.vi ‏107 KB

Delete from multiple rows elements from Array

I have an array that contains about 3700 rows, and 4 columns. Every 37 rows a cycle of data begins. I would like to delete the first row of every cycle of data (i.e. row 1, row 38, row 75, row 111, etc -- until I have deleted every 37th row in the entire array). Then if possible I would like to take an average of rows 2 through 37, 39 through 74, 76 through 110, etc...
Any help would be greatly appreciated.

> After I modify the arrrays, I am displaying them both in lab view (in
> multiple different graphs and a table), and then also using active X
> to transfer the data to Excel (where is will be re-arranged and
> plotted accordingly).
>
> I indeally need to get an average of the points in the array about
> every 36 rows, and then display this, since I am looking to track the
> output decay over time. If you have any suggestions as how I might
> find and average of every x number of rows in an array, and either
> input these into another array or a table, that would be greatly
> appreciated.
>
I can't see the original post about the data shape, but if you have a 2D
array, wire it into a For loop. Use i mod 36 equals 0 to select whether
you
add the array to the current total in the shift register, or whether
you divide the total array by 36 and append it to the averages array,
then overwrite the total to restart the process. If the rows isn't
doesn't contain an integer multiple of 36 rows, you need to deal with
the excess data either ignoring or making an average with a different
denominator. I'd assume you do this outside the loop.
Greg McKaskle

Deleting elements from a binary heap

I have to create a binary heap class and perform various operations. Every operation works except deleteMin, which gives an "ArrayIndexOutOfBoundsException: -1" exception in every case I've tried. Supposedly it's coming from line 85, which I put a line comment next to in the code below.
     * Deletes the smallest element (the root) from the heap and returns that value.
     * The heap is then reordered so that it is still a valid heap.
     * @return the root of the heap, a T type value
    public T deleteMin(){
        if(size == 0)
            throw new MyException();
        T returnValue = arr[0];
        T item = arr[size-1];
        size--;
        int hole = 0;
        int newHole = newHole(hole, item);
        while(newHole < arr.length - 1){
            arr[hole] = arr[newHole]; // ERROR IS HERE?
            hole = newHole;
            newHole = newHole(hole, item);
        arr[hole] = item;
        return returnValue;
     * Gives the index of where the next hole in the heap will be.
     * @param hole the index of the current hole
     * @param item the last element in the heap
     * @return the index of the next hole to be checked
    private int newHole(int hole, T item){
        int newHole = -1;
        if(arr[2*hole + 1] != null || arr[2*hole + 2] != null){
            if(arr[2*hole + 2] == null){
                if((arr[2*hole + 1]).compareTo(item) < 0){
                    newHole = 2*hole + 1;
            else {
                int smallerItem;
                // may need >= param
                if((arr[2*hole + 1]).compareTo(arr[2*hole + 2]) > 0)
                    smallerItem = 2*hole + 2;
                else
                    smallerItem = 2*hole + 1;
                if((arr[smallerItem]).compareTo(item) < 0)
                    newHole = smallerItem;
        return newHole;
    }I know I set newHole = -1 in the private method, which may be the problem, but the pseudo code my teacher gave me says to do just that. She gave us the pseudo code using a heap of int, the code is designed for a generic, comparable class. The test class uses a heap<String>. I just can't see why the problem is arising. Can anyone see where I've gone wrong?
Edited by: sublimeph03nix on Apr 23, 2009 1:57 PM
Edited by: sublimeph03nix on Apr 23, 2009 2:03 PM

arr[hole] = arr[newHole]; // ERROR IS HERE?I'd say that I bet newHole == -1, so you're trying to access element -1 in the array, which of course is out of bounds.
You have heard about debuggers, haven't you?

Dynamically create empty mcs and asign elements from array and loadmovie

I'm creating an educational game for my school students.
A little boy is flying through the city when he encounters objects flying from left to right.
He hears a SOUND eg: Dog - he must go and click the dog image with the flying cursor. There are at least 5 DIFFERENT objects that should be flying on the screen. There could be various of them at any one time.
I have the roots of the images in an xml file. And the actual swf are in a file called IMAGE and the sounds in SOUND.
My problem is that most tutorials I see use the attachmovie method but I don't want to put all the swf's in the library as there are hundreds.
I have to use the loadmovie method.
I take it I have to loop through the array and assign each element to an empty movieclip which in turn is in the loop so you get 5 empty clips - I will use i (index). It doesn't seem to be working. I shall keep trying and post back here if I get any luck but I'm running out of ideas.
Then the objects have to float across the screen. Don't know whether to use tween object or onEnterFrame handler or other. AND someone has mentioned using setinterval to "spit out" the objects.
BUT if I have five flying across the screen I'm left without clips to stick in any more.
Oh my head hurts but I will keep going.
CHEERS if any help is around. This should be quite a standard thng for game developpers. Code at the moment
function loadEnemies():Void {
enemy_xml = new XML();
enemy_xml.ignoreWhite = true;
enemy_xml.onLoad = function(success:Boolean) {
if (success) {
_root.parseEnemyXML();
//enemy_xml.load("level_"+level+".xml");
enemy_xml.load("data/animal_catch.xml");
function parseEnemyXML():Void {
rows = enemy_xml.firstChild.childNodes.length;
for (var i:Number = 0; i<rows; i++) {
var row_string:String = String(enemy_xml.firstChild.childNodes[i].firstChild.firstChild);
_root["row_"+i+"_array"] = row_string; //MAIN ARRAY holds an array images/dog_a.swf/ images/cat_a.swf etc... all five
_root.createEmptyMovieClip("enemyObjects", 1);
enemyObjects.createEmptyMovieClip("holder_"+i, i);
_root["object"+i] = new Sound(enemyObjects["holder_"+i]);
trace(row_string);
loadMovie["row_"+i+"_array"], ["holder_"+i]
if (level == 1) {
alerts_mc.play();
} else {
currRow = 0;
rowCounter = 0;
OK got to about here BUT
a. I started to get confused around the createEmptyMovieClip part
b. I KNOW I shouldn't have Sound(enemyObjetcs etc... BUT I copied the code from a tutorial and I don't know what to replace it with.
I'm close but I need a little polishing.

It doesn't do you much good to work with borrowed code that you do not understand. Your best bet will be to start small, creating one functional piece of the puzzle at a time, and work your way up. Start with making sure you are loading and parsing the xml properly, then set about loading the external content, then see about making that content move around, etc...
In the code you show, your loadMovie line of code does not resemble anything I have seen before, looking more like (but not quite like) a multi-dimensional array element than a loadMovie() function call. If you find you need to have control of the items as soon as they load, then you should consider using MovieClipLoader.loadClip instead of loadMovie. The MovieClipLoader class provides features, such as to be able to determine when items have fully loaded.

Memory/Speed of Split 1D array vs Delete from array

Just wondering how Split 1D array works - does it create two new arrays in a new section of memory or does it just split the existing array in two, reusing the memory in place. (assuming that the original array is not needed elsewhere). If the latter is the case then presumably it is more efficient to use split array than delete from array if I want to remove element(s) from the beginning or end of the array. Is there a speed advantage as well?
If I use split array but don't then use one of the output arrays is that memory deallocated or does the array remain in memory?
Thanks
Dave

Ok please ignore the results I posted earlier, they are rubbish - not least because I got the column headings mixed up but also because my code was full of bugs
So, here is a revised table, and the code - which hopefully only contains a few bugs... I'm not clued into benchmarking yet so please feel free to rip the code apart.
I still get different results depending on where in the array I split it, most noticeably with subset and reshape. There is no effect with split. I'm guessing this is to do with the memory allocation. (I have not preallocated memory in my code, but I did wire the output arrays to Index Array)
Message Edited by DavidU on 08-12-2008 04:49 PM
Attachments:
Benchmarks 2.png ‏13 KB
split array test.vi ‏25 KB

Deleting elements from Arrays.

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