While Loop in a mapping

Can I do while loop in a mapping. I know I can do this in process flow but can I do it in a mapping.

The OWB code generator produces a number of different code modes including set based SQL and various modes of row based code. In the row based code there are essentially (implicit) loops over the cursors, so there are implicit loops that you can do stuff, depends on what you are after.
Cheers
David

Similar Messages

While loop in a Hash Map

My while loop doesnt seem to work in a hash map, it works fine when I loop an array list.
It compiles but it doesnt seem to find any employees, should I use another loop?
{code
public Employee find(String id)
Employee foundEmployee = null;
int index = 0;
boolean found = false;
while(index < register.size() && !found){
Employee right = register.get(index);
String namn = right.getName();
if (namn.equals(id)){
foundEmployee = right;
found = true;
index++;
return foundEmployee;

A: while loop in a Hash Map

what if you looped on the key set?
public Employee find(String id)
    Employee foundEmployee = null;
    Set<Integer> keySet = register.keySet();
    for (Integer key : keySet)
      Employee right = register.get(key);
      if (right.getName().equals(id))
        foundEmployee = right;
        break;
    return foundEmployee;
}

Problem with while loops, please help!

I am having quite a bit of trouble with a program im working on. What i am doing is reading files from a directory in a for loop, in this loop the files are being broken into words and entered into a while loop where they are counted, the problem is i need to count the words in each file seperately and store each count in an array list or something similar. I also want to store the words in each file onto a seperate list
for(...)
read in files...
     //Go through each line of the first file
          while(matchLine1.find()) {
               CharSequence line1 = matchLine1.group();
               //Get the words in the line
               String words1[] = wordBreak.split(line1);
               for (int i1 = 0, n = words1.length; i1 < n; i1++) {
                    if(words1[i1].length() > 0) {
                         int count= 0;
                                       count++;
                         list1.add(words1[i1]);
          }This is what i have been doing, but with this method count stores the number of words in all files combined, not each individual file, and similarly list1 stores the words in all the files not in each individual file. Does anybody know how i could change this or what datastructures i could use that would allow me to store each file seperately. I would appreciate any help on this topic, Thanks!

Don't try to construct complicated nested loops, it makes things a
tangled mess. You want a collection of words per file. You have at least
zero files. Given a file (or its name), you want to add a word to a collection
associated with that file, right?
A Map is perfect for this, i.e. the file's name can be the key and the
associated value can be the collection of words. A separate simple class
can be a 'MapManager' (ahem) that controls the access to this master
map. This MapManager doesn't know anything about what type of
collection is supposed to store all those words. Maybe you want to
store just the unique words, maybe you want to store them all, including
the duplicates etc. etc. The MapManager depends on a CollectionBuilder,
i.e. a simple thing that is able to deliver a new collection to be associated
with a file name. Here's the CollectionBuilder:public interface CollectionBuilder {
   Collection getCollection();
}Because I'm feeling lazy today, I won't design an interface for a MapManager,
so I simply make it a class; here it is:public class MapManager {
   private Map map= new HashMap(); // file/words association
   CollectionBuilder cb; // delivers Collections per file
   // constructor
   public MapManager(CollectionBuilder cb) { this.cb= cb; }
   // add a word 'word' given a filename 'name'
   public boolean addWord(String name, String word) {
      Collection c= map.get(name);
      if (c == null) { // nothing found for this file
         c= cb.getCollection(); // get a new collection
         map.put(name, c); // and associate it with the filename
      return c.add(word); // return whatever the collection returns
   // get the collection associated with a filename
   public Collection getCollection(String name) { return map.get(name); }
}... now simply keep adding words from a file to this MapManager and
retrieve the collections afterwards.
kind regards,
Jos

SubVI with while loop + event structure not working in multi tab VI

Hello Everyone,
I am developing an interface for the control of a prober using Labview 2012, and I am stuck with some issue.
To start with I provide you with a simplified version of my control interface VI, and with the sub-VI used to build and manage the wafer maps.
The VI consists of several tabs: Prober Initialization, Wafer Handling, Wafer Map, Status, Error.
The sub-VI can:
1/ initialize the grid to display the map (sub VI Init Grid not provided here)
2/ import XY coordinates from a txt file (sub VI Wafer Map Import)
3/ display the coordinates and index of the die below the cursor
4/ and when a die position is double clicked, and the boolean "Edit Wafer Map" is true, then the user can change the state (color) of the die between On-wafer die and Selected Die
My issue:
If I use the sub-VI by itself, it works fine. However when I use it as a sub-VI in the tab "Wafer Map", the map does not build up and I can no further use the embedded functionalities in the sub-VI.
I suspect the while loop + event structure of the sub-VI to be the bottleneck here.
However I don't know which way to go, that's why I'd be glad to have some advice and help here.
Thank you.
Florian
Solved!
Go to Solution.
Attachments:
Control Interface.zip ‏61 KB

Hi NitzZ,
Thank you for your reply.
I tried to save the VIs in LV10, please tell me if you can open them now.
Inside he event structure there is quite some code, and since I don't want to make the main vi too bulky, I would like to keep it as a sub-VI.
As you can see from the sub-VI, the event structure is used for extracting cursor position and tracking the double click action. These events are linked, through a property node, to the image "Wafer Map" which is passed to the main vi through connector pane.
All values are passed this way as well (through connector pane). Is there another way?
Maybe "refnum", but I don't really understand how to use them...
If I use the event structure in the main vi, the wafer map is still not working. I tried it earlier.
To implement the multi tab front panel, I used a tab control, and a for loop + case structure. For each element of the case structure, there is a corresponding action.
For the case where I put the code (element=2) for Wafer Map, I also control the execution of the code with a case structure activated by the button "REFRESH". Otherwise I end up with a freezing of the panel right after the start.
I hope these comments help you understand better.
Regards,
Florian
Attachments:
Control Interface.zip ‏104 KB

While loop issue

I've been working on this assignment for a few days and got through my problem with the IF/ELSE IF statement. Now I am running into a problem with what I assume is some poor coding of my WHILE loops.
I have this data file to input and read from:
40      Light Karen L
81      Fagan Bert Todd
60      Antrim Forrest N
95      Camden Warren
52      Mulicka Al B
89        Lee Phoebe
75      Bright Harry
92      Garris Ted
43      Benson Martyne
100      Lloyd Jeanine D
73      Leslie Bennie A
70      Brandt Leslie
89      Schulman David
90      Worthington Dan
70      Hall Gus W
50      Prigeon Dale R
63      Fitzgibbons RustyMy code is as such:
import java.io.*;
import java.util.*;
public class prgrm8
{ public static void main(String [] args) throws Exception
{ Scanner inFile = new Scanner(new FileReader("prgrm8.dat"));
     PrintWriter outFile = new PrintWriter("prgrm8.out");
          int value, ctr = 0, ctrR = 0;
          double sum = 0;
          String name = " ";
          String line = " ";
          String msg = " ";
          String filename = "prgrm8.dat";
          StringTokenizer st;
          outFile.println("REPORT");
     while(inFile.hasNextLine())
          line = inFile.nextLine();
          st = new StringTokenizer(line);
          value = Integer.parseInt(st.nextToken());
          name = st.nextToken();
     while(st.hasMoreTokens())
          name = name + " " + st.nextToken();
          st = new StringTokenizer(name);
          ctr++;
     if(value >= 90){
               msg = "OUTSTANDING";
     }else{
     if(value >= 70){
                    msg = "Satisfactory";
                     sum += value;
                    ctrR++;
     }else{
                    msg = "FAILING";
          outFile.println(value + " " + name + " " + msg);
          outFile.println(ctr + " " + "processed names");
          outFile.println(ctrR + " " + "between 70 and 89 inclusive");
     if(ctrR <= 0)
          outFile.close();
}and I am outputing the following to my outFile:
REPORT
63 Fitzgibbons Rusty FAILING
1 processed names
0 between 70 and 89 inclusiveSo I am validating when compiling now, but I am not getting the intended results( I am wanting output each students grade, name, and the corresponding message, then get the total number of names processed(ctr), and then the number of grades between 70 and 79(ctrR) . Any advice is helpful, and thanks in advance!

Here
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StreamTokenizer;
import java.util.HashMap;
public class Prog8 {
    public static void main(String[] args) {
        HashMap<String, Integer> map = new HashMap<String, Integer>();
        Reader r = null;
        StreamTokenizer st = null;
        PrintWriter pw = null;
        try {
            r = new BufferedReader(new FileReader("prgrm8.dat"));
            st = new StreamTokenizer(r);
        st.lowerCaseMode(false);
        st.eolIsSignificant(false);
        st.slashSlashComments(false);
        st.slashStarComments(false);
        String s = null;
        int i = 0;
            while (st.nextToken() != StreamTokenizer.TT_EOF) {
                switch (st.ttype) {
                case StreamTokenizer.TT_NUMBER:
                    i = (int) st.nval;
                    break;
                case StreamTokenizer.TT_WORD:
                    s = st.sval;
                    break;
                if (!map.containsKey(s) && !map.containsValue(i)) {
                    map.put(s, i);
                } else {
                    System.err.println("Record already exist.");
            pw = new PrintWriter("prgrm8.out");
            int j = 0, k = 0, l = 0;
            for (String string : map.keySet()) {
                if (map.get(string) >= 90) {
                    pw.println(map.get(string) + " " + string + "OUTSTANDING");
                    j++;
                } else if (map.get(string) <= 89 && map.get(string) >= 70) {
                    pw.println(map.get(string) + " " + string + "PASSING");
                    k++;
                } else {
                    pw.println(map.get(string) + " " + string + "FAILING");
                    l++;
            pw.println(j + " OUTSTANDING, " + k + " PASSING, and " + l + " FAILING");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                pw.flush();
                pw.close();
                r.close();
            } catch (IOException e) {
                e.printStackTrace();
}P.S. untested
let me know.
Edited by: Oclamora on May 15, 2010 6:56 PM
spelling edit

JSTL While loop quick question

Hi,
I have a hashmap that contains the keys "number1", "number2" etc.... I want to loop through as long as the next key is not null, e.g.
// Assume nextKey is the string "number1" and counter is 1
while (myMap.get(nextKey) != null) {
   // do something
   counter++ ;
   nextKey = "number" + counter ;
}How do I perform this boolean while loop? Would I need to use the forEach tag or a custom tag?
Cheers.

The easiest way to do this is to use the <c:forEach> tag providing your map as the 'items' attribute.
Each iteration exposes an object of type Map.Entry which is one key-value pair in your underlying Map object. You can then use the getKey() and getValue() methods on the exposed Map.Entry object.
<c:forEach items = "myMap" var = "eachEntry">
     Key is ${eachEntry.key}
     Value is ${eachEntry.value} <br>
</c:forEach>If you have to supply the keys yourselves (in the above example, both the key and the value were discovered dynamically), then you still use the forEach tag.
However in this scenario what you need is a loop that iterates a fixed number of times equal to the size of the map.
For this you use the jstl function taglib. For example, the below post would output the size of the map.
<%@taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
${fn:length(myMap)}You use the begin and end attributes of the forEach loop to loop a fixed number of times. The varStatus attribute provides a counter inside the loop. Thus
<c:forEach begin = "0" end = "1" varStatus = "status">
    Counter : ${status.count}
</c:forEach>would cause the loop to iterate twice printing Counter :1 Counter :2.
Finally you need to set an attribute whose value is appended with the counter to evaluate the key.
Combining all of these, your code would be
<c:set var = "key" value = "number"/> //this value will be appended with the counter to evaluate the key
<c:forEach begin="0" end = "${fn:length(myMap)}" varStatus="status">
     <c:set var = "nextKey" value = "${key}${status.count}"/>
     ${myMap[nextKey]}
</c:forEach>Does that help?
ram.

How to use one single boolean button to control a multiple while loops?

I've posted the attached file and you will see that it doesn't let me use local variable for stop button, but I need to stop all the action whenever I want but more than one single button on the front panel would look ugly... The file represents the Numeric Mode of
HP 5371A. thanks for your time
Attachments:
NUMERIC.vi ‏580 KB

In order to use a local variable, you can change the mechanical action of stop button (Switch When Pressed will work), or create a property node for it and select values. You'll also have to do a lot of work changing those for loops into while loops so that you can abort them.

While loop doing AO/AI ... Performance?

Hi!
I have been trying to get a VI to do concurrent Analog
data in and out and both the input and output rates and
waveforms can change while the VI is running. My problem
is this:
(a) If I try putting the read and write operations in
separate while loops, one or the other loop will
die in a buffer over/underrun.
(b) If I put both into the same loop, then this works
but I am limited in the choice of data-rate parameters
because eventually one or the other DAQ VI will take
too long.
At this point I have only one loop and the buffers are big
enough to hold 10 iteration. Every time one of the loops
dies I reset it. Still this seems awkward. Is there a
way of improving on the loop overhead and putting t
he
input and output in separate loops? Or any other way to
improve performance?
Rudolf

Ok, I knew that ocurences did something useful but I am
still a bit confused:
* Can you set an occurrence for an output event. None
of the examples I've seen say so but it looks like
it should work
* How do occurrences actually help with the "hanging"
problem. Does the compiler see the occurrence in
a loop and change the wait parameters?
I looked at devzone but most of the stuff I found there,
even the promising looking stuff was all about
synchronizing and triggering, not about occurrences.
Rudolf
JB wrote:
: Once in the read function, the program "hangs" until the number of
: data points is in the buffer. The same applies to the write function.
: This means that most of the time, your program is waiting.
: To sol
ve this problem, you must use DAQ occurrences (--> hardware
: events).
: For examples for using daq occurrences, type "daq occurrence" in the
: search of the LabVIEW help or even better, at
: http://zone.ni.com/devzone/devzoneweb.nsf
: Hope this helps

Error while activating any message mapping in IR: very strange

hi forum i m getting an error in IR while activating any messageMapping.
the error is too long to be posted....i m posting a few lines of that:
     Internal error while checking object Message Mapping MM_sdptestFileToFile | http://sdzpoc.com.test/sdptest (ZPOC_TEST, 1.0 of zpoctest); see details (CHECK_EXCEPTION)
     Internal error while checking object Message Mapping MM_sdptestFileToFile | http://sdzpoc.com.test/sdptest (ZPOC_TEST, 1.0 of zpoctest); see details (CHECK_EXCEPTION)
     /usr/sap/XID/DVEBMGS00/j2ee/cluster/server0/./temp/classpath_resolver/Mapdddd0cb0100311dca6090012799eddc6/source/com/sap/xi/tf/_MM_sdptestFileToFile_.java (No such file or directory (errno:2))
     /usr/sap/XID/DVEBMGS00/j2ee/cluster/server0/./temp/classpath_resolver/Mapdddd0cb0100311dca6090012799eddc6/source/com/sap/xi/tf/_MM_sdptestFileToFile_.java (No such file or directory (errno:2))

Sudeep,
Let we try this way. I'm sure you might have some existing mapping objects in IR.
Try to change that object(Description give some name) and activate again the object.
Reply your results whether you are getting the same error.
One sec before changing the object just test the mapping and change the object.
Best regards,
raj.

Can not pass data after while loop

Hello.
I have created a VI for my experiment and am having problem passing data outside a while loop to save on an excel file. The VI needs to first move a probe radially, take data at 1mm increment, then move axially, take data radially at 1mm increment, then move to the next axial position and repeat. It would then export these data to an excel file. The VI is a little complicated but it's the only way I know how to make it for our experiment. I have tested it and all the motion works correctly, however I can not get it to pass the data after the last while loop on the far right of the VI where I have put the arrows (Please see the attached VI ). Is it because I'm using too many sequence, case, and while loops? If so, what other ways can I use to make it export data to the excel file?
Any help would be appreciated.
Thank you,
Max
Attachments:
B.Dot.Probe.Exp.vi ‏66 KB

Ummmm .... gee, I'm not even sure where to begin with this one. Your VI is well .... ummmm... You have straight wires! That's always nice to see. As for everything else. Well... Your fundamental problem is lack of understanding of dataflow programming. What you've created is a text program. It would look fantastic in C. In LabVIEW it makes my heart break. For a direct answer to your question: Data will not show up outside a while loop until the while loop has completed. This means your most likely problem is that the conditions to stop that specific loop are not being met. As for what the problem is, I don't even want to start debugging this code. Of course, one way to pass data outside of loops is with local variables, and hey, you seem to be having so much fun with those, what's one more?
This may sound harsh, and perhaps be somewhat insulting, but the brutal truth is that what I would personally do is to throw it out and to start using a good architecture like a state machine. This kind of framework is easy to code, easy to modify, and easy to debug. All qualities that your code seems to lack.
Message Edited by smercurio_fc on 08-17-2009 10:00 PM

Why writes LabVIEW only every 2 seconds the measured Value to a Excel (In a while loop with 100 ms tact)?

Hi everybody,
I use the myDAQ to measure speed, ampere, and voltage of a battery driven motor. (For Current measurement, i use a Sensor which outputs a 0-10 V signal). I placed all DAQ-Assitants in a while loop with a [Wait until next ms multiple] clock and set a value of 100 ms. I thougt, Labview will now write into my text file 10 times a second all values. In fact, as you can see in the attached text file, Labview only writes in a unsteady interval of 1-2 seconds a value, which is too less.
The question: Did I do anything wrong, how can you create VI that writes you lets say 10 values a second into text file? Or is simply the DigitalMultimeter input of the myDAQ not able to sample a rate of 10 Hz? I couldn´t find any information in the specification handbook about the sample rate of the DMM?
If anyone can help me would be great! Thanx a lot, Markus
Attachments:
Measure Speed+Current+Voltage into Excel.vi ‏175 KB
Test7.txt ‏1 KB

File I/O is not very efficient. I recommend that you do you file logging in a parallel task. Have one task do your data acquision. This task would then pass the data to be logged to the logging task via a queue. That way your file operations do not impact your data acquision. Also, express VIs are not very efficient. You would be better off accessing that directly using the DAQ VIs. The express VIs contain lots of steps that do not need to be done every time you call it such as initializing the device.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

How can I reset the value of an indicator in a while loop, from another synchronous while loop?

I am running 2 synchronous while loops, one which is keep track of time, and the other is measuring periods. In the while loop that is measuring periods, I have a boolean indicator displaying whether the signal is on or off. My problem is that when the signal is off, the VI I use to measure the periods is waiting for the next signal, and displays the boolean value from the previous period measurement. While this VI is waiting, I want the indicator to display false and not the value from the last iteration of the loop.
I am using LV 5.1 for MAC.

Two things you can try:
In preface to the first, the most common (perhaps ONLY) use of local variables should be in transferring data between parallel loops. This is a matter of discipline, and creates programs that are easier to understand, take less time and memory, and are just plain cleaner. Having said that, to transfer data between loops, use a local variable.
Second solution: Instead of setting the value to false, just hide the indicator in question by using control references (property nodes for prev. version of LabVIEW). Control references are a great way to control items on a dialog or HMI screen.

Sir i am using datasocket read ,i am communicating with java but my problem is that bcz im using while loop to see if value has changed my labview consumes all the processors time ,sir i want a event like thing so that while loop is not in continuous loop

sir i have given lot of effort but i am not able to solve my problem either with notifiers or with occurence fn,probably i do not know how to use these synchronisation tools.

sir i am using datasocket read ,i am communicating with java but my problem is that bcz im using while loop to see if value has changed my labview consumes all the processors time ,sir i want a event like thing so that while loop is not in continuous loopHi Sam,
I want to pass along a couple of tips that will get you more and better response on this list.
1) There is an un-written rule that says more "stars" is better than just one star. Giving a one star rating will probably eliminate that responder from individuals that are willing to anser your question.
2) If someone gives you an answer that meets your needs, reply to that answer and say that it worked.
3) If someone suggests that you look at an example, DO IT! LV comes with a wonderful set of examples that demonstate almost all of the core functionality of LV. Familiarity with all of the LV examples will get you through about 80% of the Certified LabVIEW Developer exam.
4) If you have a question first search the examples for something tha
t may help you. If you can not find an example that is exactly what you want, find one that is close and post a question along the lines of "I want to do something similar to example X, how can I modify it to do Y".
5) Some of the greatest LabVIEW minds offer there services and advice for free on this exchange. If you treat them good, they can get you through almost every challenge that can be encountered in LV.
6) If English is not your native language, post your question in the language you favor. There is probably someone around that can help. "We're big, we're bad, we're international!"
Trying to help,
Welcome to the forum!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Getting data from a while loop while running.

Hello,
I did a program that call a sub-VI which is doing experiment and have its own timer.
The sub-VI is a while loop and the stop condition of this loop is the elapsed time of my timer.
What I want to do is to be able to get the elapsed time in my main program during the execution of the sub-VI (every second of its execution).
First I assign the elapsed time in the sub-VI as an output of it. But of course the elapsed time is only updated in the main VI only when the while loop has finished. So I tried several solution: property nodes, local variable, global variable.
When I am using global variable, I can see the elapsed time being updated during the while loop when I open the global variable VI. But the result is always the same: in the main VI the elapsed time is only updated at the end of the while loop.
I think that is the global variable is updated every time, I could be able to get its data to my main VI?
Does anyone have an idea?
Thank you,
Meach

I tried using shared variable and reference without succes.
I will keep searching.
I enclose my VI that I simplify the most but with still keeping the shape of my real program. If you can take a look I will really appreciate.
The goal is on the top-level VI to be able to see the updating data time in real time.
Thanks,
Meach
Message Edited by Meach on 07-23-2008 04:13 PM
Message Edited by Meach on 07-23-2008 04:14 PM
Attachments:
Elapsed Time.zip ‏25 KB

How to stop execution in while loop without stopping execution of other loops in the same vi

HI
I am quite a novice in Labview.
I have a problem in my project. I used a while loop inside my vi to build an array of ten values along with other loops. Then I used a stop button to stop manually the while loop. But it seems like the loop doesn't stop in the middle of the array building and so other loops in the vi doesn't work until the while loop finishes building the array and as soon as while loop execution is over, the complete vi stops. But all that I wanted was to build the array using the shift register along with the control to stop building array anytime. And not to stop execution of other structures when the while loop finishes.
Can anyone help me?
Rahul

Hi Rahul,
Modified ur Vi to work with single button.
But the subtract case is not in any loop.
So, once both the loops stop, the subtract case will execute only once. Depending on state of subtaract boolean at that time, corresponding case will be executed and the Vi will stop.
so think of a logic where u can put this also in a new loop.
Or you can also incorporate it in one of the two loops and pass the other loop's data to it.
Let us know how you will proceed in this regard
I am posting your VI as well a VI with my modifications VI in Labview 7.0 so that Thomas can give his suggestions too
Plus, always keep a time delay in your while loops.
Oh sorry, the "arrayinouttestnewfinal.vi" is the modified vi
Regards
Dev
Message Edited by devchander on 01-10-2006 06:15 AM
Message Edited by devchander on 01-10-2006 06:19 AM
Attachments:
arrayinouttestnewfinalnew4.vi ‏59 KB
arrayinouttestnewfinal.vi ‏63 KB

While Loop in a mapping

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