2009 for loop iteration zero bug

Similar Questions

• 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.

• Cannot read every value of the loop iteration for

  Hiiii...

  I developed a front-end which reads the values of serial port and display on the front panel.

  16 channels, which is a string data value. I've separated this string to read the data of each channel, but at the end of the loop for, I can read data only one channel for an iteration, and also I have to store each value iteration in a text file.

  I'm new to labview. Help, please. I have LabVIEW 8.0.

  Attached is my application code.

  This seems quite inefficient. Why don't you use a business structure? Why don't post it your code.

  In regards to the original code, you try to run by using the run continuously? I ask because I do not see a global loop, so it was not clear whether this was intended to present itself as a simple Subvi or "on-demand". If it's supposed to run continuously until you stop, DO NOT USE CONTINUOUSLY RUN it BUTTON. Use a while loop in your VI. Do not forget to place the initialization and close outside of the loop - you don't need to initialize and close the serial port whenever you loop around.

• 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.

• addEventListener inside a for loop

  Seal of the code that I need to create a number of text box controls and text is based on an input variable that will emulate columns. Each loop sets the TextArea (col) and the text (pCol) control properties and methods based on the iteration (i). When I run problems, that's when I add an event listener for the TextArea component.
  
  Rather than create a listener different for each iteration (col1, col2, col3, etc.), the listener is redefined. The result is that the last text built control reflects any changes made to the final textarea built; However, no other text controls are updated on the evolution of the corresponding text box.
  
  I don't know that I'm a little something missing here. Someone saw?
  
  Thanks in advance!

  Otherwise if you use the id as 'col' + colNum and there will be less than 10 boxes, then you can use:

  private void changeHandler(event:Event):void {}
  var idx:int = int (event.currentTarget.id.slice(-1));
  Text (placardHBox.getChildAt (idx - 1)) .text = event.currentTarget.text;
  }

  Of course, if you do a basic designation zero, you don't have to deal with the stuff of subtraction.

  TS

• 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

• changing the values of loop iteration

  Happy new year everyone!

  I have a question about changing the loop iteration number set to a loop for. I made a simple example of what I had imagined in my mind, but I knew that it wouldn't work, however, it shows what I want to accomplish. I would use a switch or something to control the loop, so you can start running to essentially infinity, which is the constant from 1000000 and then go on a number of controlled if the loop ends in fact and the code can move. Each iteration is a second.

  Thanks for any ideas you may have

  A While loop is a loop For which has no fixed number of iterations (if you allow me, he 's going to try to go to infinity).  It has a Stop indicator that stops the loop if True is wired for it.  Note that if True is wired to the stop indicator when the loop begins, the loop will always be executed (once).  In this sense, it is slightly different from a loop For 0 cable to the input of N (which does nothing).

  So some time, use a loop to do this.

  Bob Schor

  PS - you should know...

  PPS: I just looked at your VI.  I'm sure you realize that the way to data flow rules you need to set the Boolean and order digital before start the programme - once it starts and gets into the while loop, changes you make outside the loop will have no influence on the code inside the loop.

  Have you taken the LabVIEW tutorials?  If so, and if not, go look again, attention to the program flow, loops, etc..

• Préallouée VI environment in paralleled for loop

  Hello

  I searched a bit and couldn't find that everything about this specific issue.

  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.

  Thank you!

  
  

• For loop creates 1 d data table

  Hello, I am building the circuit below, and I'm running into a lot of problems with the loop, creating a table 1 d of data from certain types of data such as the ERROR OUT and the VISA NAME of RESOURCE. I understand why it does this, but I only need the last value in the table (the value of the last iteration of the loop for). This is true for me for the error, resource name of visa, and I was thinking of using the Boolean value that indicates when the for loop.

  Is there a simple way to extract the last value in the table 1-D so that it is correct to pass along trails, VISA and ERROR type?

  You actually create a block diagram, not a circuit.  A circuit is an electrical system including devices and wires.

  If you right-click on the tunnel and choose disable indexing, then you get the value of the last iteration rather than a 1 d table.

  I recommend you watch the LabVIEW tutorials online
  LabVIEW Introduction course - 3 hours
  LabVIEW Introduction course - 6 hours

• 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

• For loop inside a loop For

  Is it possible to perform all iterations of the inside of the loop for each iteration of the loop outside? I've attached a screenshot of my program if it helps. If possible can you tell me how to do it please?

  A thought I have is that I think you want these nodes of feedback reset for each iteration of the loop from the outside.  Personally, I would like to change the shift registers (it would clean your scheme a little more).

• 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

  

• Capture of sequences of images - issues with nested for loops

  Hi all

  I've written a vi. to capture a number of images ("Image") and save these images, sent to a folder of my choice.  Each image is identified sequentially.  However, I would like to make a number of iterations ("run") of this capture sequence, such that each image file name would be "Filename (Run) _(Image_No).png", for example run 5, image 10 'Filename 5_10.png.  I tried a nested for loop for this but I have an error message 'Current asynchronous i/o Operation' (I have attached a printscreen).

  Can someone help me solve this problem?  Please find attached my vi.

  Sincere greetings and thanks,

  Miika

  Hi toto26,.

  Thank you for your response.  I solved the problem by using a sequence structure flat - file in the first image and all the treatment in the second.

  Kind regards

  Miika

• Check if for loop finished

  My question is how to check if the for loop complete? I'm controlling a supply of Genesys Lambda and taking a linearity data. I need to check if the loop is completed, ask the user to reverse polarity and resume data. Got only the first part of work. Looks like I can't just check the loop for the last iteration.

  I have attached my code for anyone to check if possible.

  Thanks for your help.

  Peter

  Altenbach wrote: you could put another loop with a FOR 2 wired to N around the code, display the conditional terminal and exit the loop prematurely, according to the results of the dialog box.

  Here's a quick project, modify as necessary. (There are a few tips, for example, you must enable messages only on iteration 0. Easy to fix. )

  

  (I have DAQ or even understand your material, so I can't test, but things don't seem quite right across.