Check if for loop finished

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• When is it OK for looping while you wait event?

  Newbie question: in a world of logic non-blocking, when is it a good idea to loop waiting for something finish?

  For example, I am told to check to END_OF_MEDIA (via PlayerListener) to see if a song I played with ToneControl is finished. So is it possible to just create a loop and wait for it be triggered?

  Here is a very simple (albeit artificial) example. I want to play a melody (using ToneControl) twice. I play once, wait until it's done, then play again. END_OF_MEDIA tells me it's done. But have I not need to sit in a loop, then waiting for END_OF_MEDIA? Is it OK? It looks bad, but I don't know what would be the 'right' way.

  Thank you.

  Roricka

  The code I used was something called an anonymous inner class Java. Here's another version that does not use this construction somewhat obscure:

  void startTune() {    Player p = Manager.createPlayer(...);    p.addPlayerListener( new MyPlayerListener() );    p.start();}
  
  class MyPlayerListener implements PlayerListener {    public void playerUpdate(Player player, String event, Object eventData) {        if (event == END_OF_MEDIA) {            processEndOfMedia();        }    }}
  

  Note This class myplayerlistener is declared inside the MyScreen, right as well as the methods of the class and variable fields. All this has done is to convert an anonymous inner class in an inner class with a name.

  Now, it might look like you can move then comes from the MyPlayerListener class in a separate file named MyPlayerListener.java. But this does not work, at least not directly. The reason is related to one of the strange features of inner classes in Java (anonymous or not): an instance of an inner class carries with it an implicit reference to an instance of the containing class. That's why playerUpdate() can call processEndOfMedia() as if it was a MyPlayerListener member function, even if it is a member of MyScreen function. Somehow, an instance of MyPlayerListener lives a dual identity as an instance of MyScreen.

  If you want that myplayerlistener has stated in its own file (or if you want her to be a top-level class, not public in MyScreen.java or a static inner class of MyScreen), the rules of the language to say that there can be more than double-identity of nature. At this time, you cannot call the processEndOfMedia() in the same way as a MyPlayerListener instance does not have a reference to an instance of MyScreen. (In fact, it has no way of knowing that processEndOfMedia() is a function in the class MyScreen!) The way out of this is to give MyPlayerListener a way to refer to a particular instance of MyScreen. Here's one way:

  class MyPlayerListener implements PlayerListener {    private MyScreen client;    public MyPlayerListener(MyScreen client) {        this.client = client;    }    public void playerUpdate(Player player, String event, Object eventData) {        if (event == END_OF_MEDIA) {            client.processEndOfMedia();        }    }}
  

  Then, back in MyScreen, you need to change the call to the constructor:

      p.addPlayerListener( new MyPlayerListener(this) );
  

  And if you put MyPlayerListener in another package that MyScreen, you must also change the visibility of public processEndOfMedia().

  Anonymous inner classes are very convenient for these listener classes little, but they do not have the code a bit difficult to read. Put them in their own compilation units are more work, but it makes the code a little easier to manage, especially when come back you after a few months and try to understand what made you the way back when.

• for loop nested within a while loop

  I wrote a data logging VI to get data from a data acquisition, then write on a worksheet. It worked well. What I'm trying to do now and I am having problems is to place that vi within a while loop that will automatically write a new file name after the loop For ends its iterations. In a text based program when the loop finished I would just send it to the while loop for her write the new file name, and then run the loop data collection and spreadsheet iterations of writing.  Here is the general outline of the operations of the program.

  Set the file name and path based on iterations of the loop (eventually this will be the date and time)

  run to the loop for the specified iterations:

  read DAQ

  write data to a .csv spreadsheet

  In specified iterations are more:

  new name of file writley

  Rerun the loop for

  Repeat this until you press stop

  What actually happens is the file name and path are established, the loop runs through its iterations, but wrote that the last set of data and then the program stops.

  any ideas?  Program attached

  Don't know about the termination of the program. I replaced the methods with a random number generator and everything seemed good environment according to the writing of worksheet to add instead of create a new file each time that work.

  p.s., cleaned up the wiring to make it readable - counties of cleanliness.

• For loop within a while loop

  I have for loop within a while loop... admission to the for loop N comes from the VI selection... the while loop I a condition essentially statement it stops just after to finish all the iteration in loop...

  Entrance to the N loop is bascially driven by a local variable... that's the problem Iam having:

  When I press the Start button to run the program... regardless of the output of the select VI is gives the N of the for loop, then the loop starts and then ends in place... and when the output of the select statement takes a different value (the N of the loop for) loop not work until I restart the program again... What can I do so that the for loop runs again for another value of N, the RUN program button is enabled.

  1. clean your diagram.  Style guides suggest keep the pattern of a single screen.  With a little effort, I was able to get your DB less than 1600 x 1000 pixels.

  2 then I can see (some) it happens all at once. This thing does nothing?

  3. local variables can lead to race conditions.  Output in Angle position may be a race condition, although is probably not what you wanted to do.  What does the wired local time at the moment present terminal meter? (Ooops! Two controls with the same name - which can be quite confusing as well!)  If you need or want two components of façade having the same text, use the legends.  Make the labels is different so the comic is more readable.

  4. having more than one Dequeue function on the same queue will lead to unpredictable results.  When an item is removed, it is removed from the queue and is not accessible to any other Dequeue function.  In parallel loops, you have no way of guessing which Dequeue will seize any particular element.

  5 use Boolean reverse instead of Select with wired False to true and true cable at the entrance to false entry. Better, just make the case of forgery in the structure of the case within the for loop the real deal. No required reversal.

  6. I was not looking for to determine the logic of the code within the structure of this case. It seems I could have posted a much simpler way to do this several weeks ago.

  7. use multiply from the Digital Palette rather than a node form multiply by 4 or 1.8. Uses less space BD and is much easier to read.

  8. as has been suggested, learn how to work the machine architecture and the State of producer/consumer.  They can make your life much easier.  Do not try to convert immediately to these models.   It's too much bite to at some point.  Learn how they work first.  Make a few simple examples.  Then rewrite this program in this format.  Probably faster than fixing what you have now.

  Lynn

• How to end Vi in a For loop

  Hello. I enclose my Vi. I have a question about stopping a loop For I have 2 loops for the case "Test underway". I have a termial conditional that will stop my Vi but only after you have completed all the iterations of the loop For I have need of this Vi to stop immediately, when you press the stop button. I realize that it will take probably still finish an iteration, however, at the present time it waits until all iterations are performed, before coming to rest. I'm doing it with the same front button that stops the while loop. I tried a local variable, but to change a mechanical action and I prefer not to do, if this is possible. There was a lot of posts related to this topic here on the forum but I couldn't find the one suited to my needs. Thank you for your time.

  Your While loop waiting loops to stop, so you can use local variables of your stop button to stop the for loops right now.

  See you soon,.

  Jimmy

  

• Creating tables in a nested for loop

  Hi all.

  I was stuck in this problem for quite a while now and I still don't know how to continue. Some outside the entrance would be greatly appreciated!

  I'm doing the following:

  -Take an array of numbers, to check if they are within a certain range (e.g. between 2 and 4)

  -Build two new arrays: one with all the numbers that are inside the beach and the other with the rest.

  An additional condition is that the amount and value of the range conditions will change (for example, it could be between 2 and 4 only / 2, 4 AND 6 and 7 according to the entry)

  To treat this, I created two nested for loops - one that goes on a table that contains conditions of the beach and inside that actually go and check if the values are in the range. I think I did that part successfully, but the next part is confusing to me - how to actually create the tables separated within two loops for?

  My apologies if I did not explain it well. Another method to support this problem is I want to translate following LabVIEW:

  Ranges of table / / [1 5 7 10] exodus-> This means we want to divide numbers based on those who are in (1,2) and (4.5) against those who are not

  Table of values / / [2 3 6 11 3]

  EndOperationDelegate table / / array of values within the range
  Table outValues / / Array of values out of range

  for m = 1:size (ranges)

  for n = 1:size (values)
  If (THE NUMBER IS on the INSIDE of EACH RANGE)
  EndOperationDelegate = [EndOperationDelegate NEWNUMBER]
  on the other
  outValues = [outValues NEWNUMBER]
  end

  end
  end

  Sounds easy enough, but it gets so chaotic with Labview that I don't know what to do. I have attached a reference image - insertion in the array function is not in fact add to the table, it creates a new table. How can I save that for when the nested for the ends of the loop?

  I have seen a few examples with shift registers which lie in a loop and I couldn't successfully that transfers in my block diagram.

  Any help/direction would be greatly appreciated.

  Hello!

  See the following example to understand how you can create a table in the loop For

  

  In your case, you also can uce conditional terminal to create a table only when then located nearby. It makes the code much cleaner that the structures of the case

  Hope this helps, if not, let me know if I can help you!

  Marcin

• jump on a for loop

  Hi guys,.

  I have the impression that this is a stupid problem and know the solution if probably obvious, but I can't seem to find it

  I have a loop with several inputs and outputs in a Subvi.  When the Subvi is run all entries are read, the loop is skipped, and the outputs are sent.  Does anyone have any idea why the for loop is ignored?  Everything seems to be wired corretly?...

  The vi is attached.

  Thank you!
  Christopher

  I can't open your code due to my having LabVIEW 2009, but here's one thing to check: do you have automatic indexing on at all?  Perhaps, he does not run the expected amount of time due to a table being wired like 'auto-index' to your loop for?

  Another thing to check is try to place an indicator on the output of the variables 'N' and 'i' of the loop (letters of blue boxes that appear automatically).  That should tell you the "N" land of shadow of time it will perform an iteration and the value of the current 'i' reiteration.

  When you use the execution to highlight, you see it execute the code inside the loop?  If so, how many times?  And how did you expect?

• 3D table organization fomr a 1 d array in a for loop

  Hello-

  I am currently using a program OR opening multiple files (http://zone.ni.com/devzone/cda/epd/p/id/818). As a side note, I noticed that the files are automatically organized by name once records are returned from the Subvi. Will be called BxCy where x is a number and y is a number to two digits (e.g., B2C34) and within each file, I load a 1 d table which I extracted the files, I am loading.

  I want to do is organize the output so it has the structure of

  Page C1

  Line B1 [(table 1 d)]

  Line B2 [(table 1 d)]

  ...

  Line Bn [(table 1 d)]

  Page C2

  Line B1 [(table 1 d)]

  Line B2 [(table 1 d)]

  ...

  Line Bn [(table 1 d)]

  and so on.

  My first question is that I'm not 100% sure that the file names will be organised by name in the lu multi-fichier VI so is there someone who can check it out? Second, even with what I would like to know if there are effective methods to achieve this. Should I just use two tables index to classify based on their number of anc C B? This seems to slow down and I saw on other positions the function array reshape could speed up the process but I'm not sure how to proceed. I don't have access to the structures of inplace (I don't know if I just forgot to install this module, or if it was not included in my subscription LabVIEW).

  The program that I joined is in LabVIEW 2009 SP1 and I'm on a Windows 7 64-bit machine.

  Thank you in advance!

  J

  • You did not include the subVIs. Please do.
  • Never convert a path to a string, unless you do something specific OS. Use 'strip path' work on the name of the file as strings, then convert back to a path using "build path" if necessary.
  • To create a 3D tables 1 d array, you need two stacked FOR loops. Pages in the loop external and rows in the inner loop and outoindex in the output in loop tunnels. You will automatically get a 3D Board.
  • It might be much easier to use the "list of files" with a motif of "B * C *" for example. Is the number of the page always 1 and the numbers of two line numbers (padded with a zero not significant as appropriate)? In this case the sorting will be correct.

• Parallel for loop 2D table

  Hello

  I don't have any experience with parallel for loops, so I need your help.

  Goal: To do a calculation (average, average) on the rows (or columns) table 2D as quickly as possible. The calculations are independent of each other and I would get a table 1 d with the results.

  I read a few posts on parallel for loops and I would like to find an example for my trivial problem, but I can't.

  Could you help me, it is possible is improve it the effectiveness of the calculation on lines with parallelism in LabVIEW? and it is, could you post an example how to do?

  Thank you

  If the speed issues, do not write your own "average." First of all, it already is in the range of statistics, but then you must be inline your average VI or do the calculation explicitly (as shown below). the size of the array never changes for the duration of the loop, it seems redundant to get the size of the array on each iteration.

  Here's what you could do.

  

  On my bench, it's much faster than the use of 'mean.vi' of the palette. Average a overhead, Subvi (1) (2) needs to get N with each call and (3) is also an unnecessary error checking.

  (Sorry, I have 32 processors, so the number of instances is set a little high. Modify if needed).

• Oracle Business Rule - Table of decision for loop

  Hi Experts,

  I have the scenario where I get the list of values, and I don't have to iterate over the values in the decision table. I can't use the normal return If so , in reason of the restriction of customer "only use table decision." Can someone guide me how to use the for loop in the decision table?

  Thank you

  We can check multiple values of the same element in the decision table. so no need to make a loop.

• JavaScript for loop to execute Advanced Actions - execute Javascript does not?

  I use a loop to check the value of a Cookie.  When I add this using Execute Javascript it works fine but I want to run with certain other actions, if I want to use Of execute advanced Actions. When I add this coded to an action to run Javascript in the breast to perform advanced Actions code disappeared if I open the Script window again once.  I try to remove the code for loop in bold below and then the remaining code remains.  So I think that the problem must be with the loop for, but I don't see anything wrong with this code and I have, as I said that this code works fine if I use Javascript to run on its own. I've attached a video clip below to show what I mean.

  var task1_value = readCookie ("task1");

  function readCookie (name) {}

  var nameEQ = name + '=';

  var CA = document.cookie.split(';');

  for (var i = 0; i < ca.length; i ++) {}

  var c = ca [i];

  even if (c.charAt (0) ==' ') c = c.substring(1,c.length);

  If (c.indexOf (nameEQ) == 0) return c.substring (nameEQ.length, c.length);

  }

  Returns a null value.

  }

  I found that window JavaScript of CP does not like loops.

  Your best bet is to put the function in an external JS file from the top of the page. I always run scripts in an external file. Really helps debug that you do not have to republish Captivate. Just change your code and refresh the browser. If you use external file you can store all your functions there.

  I would also look into using the local storage instead of cookies. Very easy to implement and you can store a ton of information.

  Local storage - dive into HTML5

• parallel processing: for loop taking place

  Hallo,

  I have a loop 'for' runnin on this system: LabVIEW2009, windows7, intel i7.

  I wonder if and how I can tell to LabVIEW that he would be allowed to run different iterations of the loop at the same time (concurrently) on my processor with 8 cores.

  Now, it will execute the next iteration when it ended the previous, even one so is there no dependencies in iterations.

  I want to give a 'ownership' of the loop, which means that it can be "unfolded" for parallel execution.

  Thank you

  Pier

  pop up on for loop and select "configure interation Prallelism."

  Activate it.

  Wire a certain number to the new 'P' of entry to specify how many processors to spread it everywhere.

  Ben

• for loop in formula node does not

  Hello

  I; m trying to use for loop in the node of the formula, but it is does not work. I want the output (y1) product value in certain range (a and d, and of course one is smaller than d). I ' do not use primitive labview since a and d are keep changing (both are variable). I tried to put "return 0;" after the y1 equation but the error popup.

  The issue of the loop works not because it gives the last value (I average would be ""). It does not begin with an (initial) value.

  Please help me how to solve this problem...

  Pls ignore other variables not used in the equation. Thank you!! A lot

  Your code works.

  

  But why you use loop?
  You get the last value, so you can get it in a single step with x correct;

  Also why you say that can not use primitives?
  If you use wire instead of terminals or local variable States values constant.

  Y1, y1_2, y1 3 is the same values calculated differently.

  

• parallel for loops does not

  Hello.

  I'm learning the multi - thread programming. To start, I use "parallel for loops" and I was surprised that it does not work. One - thread loop work a few times faster (depending on settings) that multi - thread. I don't know why, and it is my request to correct my Vi to work properly.

  Lenovo, G580, Windows 7, 64-bit computer

  Intel Core i7 3632QM
  Ivy Bridge
  Specification Intel (r) Core i7-3632QM CPU @ 2.20 GHz
  Package (platform ID) Socket 988 B rPGA (0x4)
  Number of hearts 4
  Number of threads 8

  LabView 2011.

  Altenbach says:
  

  Gibbon wrote:

  What was 'strange' behavior?  In "linia dluga" when inside the loop is on '1' of the "spreed up' between one and multi-fil is about 3 times, when I put it in '20' this grow to 6.2. It was strange form me, becourse I expect a similar value.

  A parallel FOR loop has an overhead for parallelization (split the problem, then go back the results, etc.). If the code is very fast, the overhead is proportionally larger. If the Subvi takes a long time to complete, the overhead of parallelization is insignificant. It is often not worthwhile to parallelize the loops with a very simple and fast code.

  Gibbon wrote:

  Altenbach - I have another question if you can help me - how did you "seconds relative high resolution." VI "? -I want to say how did you know that there is this 'vi '. And thanks a lot for your modyfications.

  You can find it in vi.lib\utilities. It is well known.

  Maybe not well known enough!  the 'Hidden gems' package adds to your palattes.  It has also been considered by a nugget of the community

• For loop runs with the value of N unwired

  In this case will be a loop run connected to the loop N worthless? I have seen a few examples of the loop for run without a certain number of times set to be ran wired or for example a size of table or something like that.

  PauldePaor wrote:

  Here's a program I am and as you can see the image that the program runs without the loop N being wired. The program will run without problem

  As everyone else has said, you don't have to plug something on N.  If you wire up a table for loop for input "auto-index", the loop for will run automatically the smaller table size.

  Perhaps an example will help:

  

  This makes a loop on my table size (in this case, long of 5 elements).  On the edge of the loop for which resembles [] brackets, indicates that it is auto-indexé.  The loop should go through each item one at a time (1, then 2, then 3, then 4, then 5).