parallel for loops does not

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• For loop does not or will not stop according to the toggle switch

  This is the VI I work with joint. The VI is a bit long, but the two loops on the left side are loops that have problems. When the program works and I hit the switch 'START of CYCLE' rocking the loop simply does not work. However, when I toggle switch on before the start of the program, the loop will run the way it is supposed to, but never shuts off when the switch is turned OFF.  Any help is appreciated. Thank you.

  billko wrote:

  James.Morris wrote:

  Good, so as I was saying before the left of right data flow, so things on the right don't peut/don't do nothing until things on the left ends.

  I've seen you say this twice now, and it is not true.  Data flow from the output of a node to the input of another.  This means "from left to right" because it was designed that way.  If you had two subVIs, 'A' and 'B', no cable together and 'B' to the right of 'A', it does NOT follow that 'A' will run before 'B '.  If, for some silly reason, you had 'B' exits on the left and the 'A' entries on the right, you could connect the outputs 'B' to 'A' and the data would be sent to the right left.

  But I'm fairly certain that I have misunderstood the information you were trying to convey?  (It wouldn't be the first time, believe me!)

  Ah, point taken, I'll have to adjust the way in which I explain the data flow, stream of best practices not only. It is difficult to describe the flow of data to a beginner without using the directions. I was just trying to convey that the Boolean value that it has a cable upwards is providing data for both the first structure of matter and the main While, loop which means they expect both for the info of the Boolean value. If he makes the request to wait for the user to click on the Boolean value, then the loop will wait too long.

  I think that the data stream is one of the biggest problems new users seem to fight with and this thread is an example of this. EMART can make this code work, even if it's a mess, but I think it is obtained when the additions of code got on immediately to the point where he needs a little more experience help to understand how do to encorporate more functionality without messing up what already exists.

• FOR loop does not update the local Variable

  I am newer to labview, and I can't wrap the head around why not a habit of local variable to update in the code if it updates on the dashboard. Anything im missing?

  Assume that you are talking about the local variable of the 'State of the cell. The terminal updates every 500ms in the small top loop, the local variable indicates simply that the indicator and thus updates also.

  The problem is "dataflow" and you need to familiarize yourself with the concept!

  Once the while loop starts, the local variable is reading and inside the loop begins. Most likely, the local variable is read before it is updated in the small loop, so most likely returns the value of a fade on the first iteration of the while loop. Now the small loop continues to go twice per second for about five seconds. Only after the loop FOR (and everything else inside the while loop) completed, the while loop will go to the next iteration, date on which the local variable is read once more, this time with the last value of the last for loop iteration of the previous iteration of the while loop.

  In summary, the local variable updates very well, it's just that the code does not read the new value around most of the time.

  Your VI is full also potential competition conditions caused by the over-use of the local variable. You need to respect the proper execution order by eliminating local variables.

  So what is the solution? Hard to say without knowing what the VI is supposed to do. Most likely, you will need to remove the inside OF the loop and use it outside while loop for everything.

• For loop does not

  Hello world

  I try to use a simple loop for and it does not work. I have a group of drop-drop that I named Dropdown.A - Dropdown.F

  I am able to make a table using:

  var Dropdown = this.getField("Dropdown").getArray ();

  However when I try and loop on the table to help:

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

  Console.println (dropdown [i]. (Name)

  }

  I get "Drop-down list [i] is not defined" so it seems that the i is never replaced by the correct when number one loop.

  We never seen this or know why this is happening?

  Thank you

  Mike

  This code works for me in an event of the button mouse up, so there is more than that, or I do not understand how you use.

• For each does not properly in the XSLT file to two loops on a single node

  Hi all
  
  I'm transforming 2 inputs to a single target using XSLT. Both of the target entry of the same pattern and have the child element.
  In the XSLT, I gave this condition.
  "< xsl: for each select="$Variable1.payload/ns1:BookStore/ns1:Books ">
  < xsl: for-each select = "/ ns1:BookStore / ns1:Books" >
  "< xsl: if test="$Variable1.payload/ns1:BookStore/ns1:Books/ns3:BookId = ns3:Books / ns3:BookId ">
  
  My second for each does not work and in the target, I'm getting double elements. Help, please. Here are two xml source and xml desired target.
  1 XML source:
  
  < bookStore >
  < book >
  Name1 < name > < / name >
  author1 < author > < / author >
  < ID > 1 < / BookId >
  < quantity > 2 < / quantity >
  < price > < price / >
  < status > < / status >
  < book >
  < book >
  name2 < name > < / name >
  Author2 < author > < / author >
  < ID > 2 < / BookId >
  < quantity > 2 < / quantity >
  < price > < price / >
  < status > < / status >
  < book >
  < book >
  < name > NAME3 < / name >
  author of 3 < author > < / author >
  < ID > 3 < / BookId >
  < quantity > 2 < / quantity >
  < price > < price / >
  < status > < / status >
  < book >
  < / book >
  
  XML source 2:
  
  < bookStore >
  < book >
  < name > < / name >
  < author > < / author >
  < quantity > < / quantity >
  < ID > 1 < / BookId >
  < price > 100 < / price >
  < status > < / status >
  < book >
  < book >
  < name > < / name >
  < author > < / author >
  < quantity > < / quantity >
  < ID > 2 < / BookId >
  < price > 200 < / price >
  < status > NA < / status >
  < book >
  < book >
  < name > < / name >
  < author > < / author >
  < quantity > < / quantity >
  < ID > 3 < / BookId >
  < price > 300 < / price >
  < status > < / status >
  < book >
  < / book >
  
  Desired target XML:
  
  < bookStore >
  < book >
  Name1 < name > < / name >
  author1 < author > < / author >
  < ID > 1 < / BookId >
  < quantity > 2 < / quantity >
  < price > 100 < / price >
  < status > < / status >
  < book >
  < book >
  name2 < name > < / name >
  Author2 < author > < / author >
  < ID > 2 < / BookId >
  < quantity > 2 < / quantity >
  < price > 200 < / price >
  < status > NA < / status >
  < book >
  < book >
  < name > NAME3 < / name >
  author of 3 < author > < / author >
  < ID > 3 < / BookId >
  < quantity > 2 < / quantity >
  < price > 300 < / price >
  < status > < / status >
  < book >
  < / book >
  
  Thank you

  Hello

  It will not work like that... To do something like the following... Only one for each...

  
    
    
      ns1:Name
      ns1:Author
      ns1:BookId
      $Variable1.payload/ns1:BookStore/ns1:Books[ns1:BookId = $bookId]/Quantity
      $Variable1.payload/ns1:BookStore/ns1:Books[ns1:BookId = $bookId]/Price
      $Variable1.payload/ns1:BookStore/ns1:Books[ns1:BookId = $bookId]/Status
    
  
  

  I don't have to check the syntax, but you get the idea...

  I hope this helps...

  See you soon,.
  Vlad

• SR400 while the loop does not work

  Hello

  I'm using LabVIEW for control SR400 through a GPIB card.

  I use SR400 to count the number of signal in a second, wait 0.05 s, then again count the signal once, wait 0.05 s once again, and so on.

  However, the while loop didn't iterate. When I started the program, it is only once.

  In execution of highlight mode, when an iteration is finished, he waited a long period starting the next. In normal mode, it doesn't have to iterate.

  Also when I clicked the stop button, it's been clicked. However when I wrote a very simple program, the stop button worked normally.

  In any case the button issue is not very important. I don't care that the program iterates forever or not. I just want to iterate.

  I searched the jury and had not could not any related problem.

  Is it better to attach my VI? The VI is in my computer lab.

  Thank you very much!

  This code just feels bad.

  (No real management mistakes, deep, stacked sequences FOR lines that are wired to iterate through only once, controls on the right and right to left, wiring weird code on average the last 10 items (Hint: means ptbypt with a length of 10 sample he would!).) If you want to use the wire of the error, the sequences would not even necessary)

  If the stop button does not reset, it means that the iteration of the loop does not terminate. It can fill in only if the two structures of the sequence ends.

  Have you tried running in execution, emphasizing fashion while looking at the diagram? Probably one of the communications is at a standstill. For example, the instrument sends really 6 bytes at the end? When you set the overall timeout and what is it?

• LabVIEW parallel for loop and OpenMP

  Hello:

  It's just a curious post, I just learned about OpenMP and I found that OpenMP helps you to parallelize loops in c about the same way that you can use the loop For parallel in LabVIEW.

  The loop For Parallel LabVIEW is being implemented under the hood using OpenMP? Or is it just a coincidence?

  No, it is not implemented LabVIEW parallel for loop under the hood using OpenMP. You might be interested to read this article on modern developments in the LabVIEW compiler architecture. Specifically, in this case, it's the DFIR technology discussed here that facilitates parallel for loop transformations.

• 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).

• How to create parallel tasks using parallel for loops

  Hello

  I'm going to put in place a program that communicates with the six logical controllers and must read the status of the system every 100 Ms. we use OPC datasockets for this, and they appear a bit slow.

  I created a uniform method of comm. for all controllers, and now I find myself this method of programming six times to communicate with each system. I was wondering if it could be done more elegant using the parallel for loop, in which case I program an Exchange once and then six workers running simultaneously. Since a picture is clearer than a thousand words, what I'm asking is:

  Is it possible to replace something like

  

  by

  

  and that for performing these tasks in parallel loop (on different cores / in different threads)?

  I have configured the loop to create instances of the 8 to the compilation, so I would 2 surplus available when running instances if I find that I need an additional system.

  The benefits of the Show method in the second photo for me are:

  * takes less space

  * changes need be made only once

  * less blocks, son and other things makes it clearer what is happening.

  * flexibility of the actual number of tasks running (8 available runtime instances)

  * If multiple tasks are necessary, I need only update the maximum number of instances and recompile, i.e. no cutting and pasting necessary.

  Unfortunately, I don't have these available system yet, so there is no way to test this. Yet, I would like to know if the above works as I hope - unfortunately the help of labview is not quite clear to me on that.

  Best regards

  Frans

  Frans, the parallel for loop will work as expected in this situation. The six tasks will run simultaneously in different threads. What part of the aid could be made clearer?

• Loop does not complete

  I have a simple loop in a function I use to remove all elements in the array:
  

  for (var i: int = 0;  I < tempArray.length;. i ++)

  {

  tempArray.pop ();

  trace ("pop:" + tempArray.length);

  }
  
  The probelem I'm having, it's that the loop does not terminate. It seems that to remove a single item, sometimes it will remove two. An event that is triggered in a separate function you may this prevents from running until the end?

  is there another method I could use to remove all items?

  use:

  for (var i: int = tempArray.length - 1; i > = 0; i--)

  {

  tempArray.pop ();

  trace ("pop:" + tempArray.length);

  }

• Conditional loop does not work correctly.

  Hello
  
  If you look at my code, its all about the analysis of a dictionary. IM check the dictionary for the word 'aardvark '. It gives me wrong all the time. When "aardvark" is the first word of the table, IE my_dictionary [0] is "aardvark". I wonder why the conditional loop does not work very well. IM checking if the user string aardvark is == my_dictionary ; he should give me the true value.
  
  Is there an error in the code? Can someone explain to me where im going wrong?
  
  PS-> put everywhere traces gives me the right output. Except for the result of the if() function.
  
  Best regards and many thanks in advance.
  Roshan Kolar

  Hi Raymond,

  Thanks for the reply. I had the problem, actually the conditional loop was perfect, the analysis was not. The reason is, a few words in the dictionary had a return of cart/jump of line/space to the index of the last after the word. It was randomly, so some words have been taken, but some were not as "vicious" == "vicious" - gives the INVALID WORD.

  So I was thinking about the parser, where I removed the unwanted last tank - now the condition has worked well. Thank God I worked even after the publication of the request.

  Thank you very much Raymond.

  Kind regards
  Roshan

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  If I have a Subvi in a parallelized for loop and the Subvi is set upon reentrant preallouee clone, the Subvi register also several characteristics of memory depending on the number of loop iteration For? My specific application is a Subvi containingvibration Analytisis screw using the previous data in their spread and filters.

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