How to pick up indices for a for loop

hi guys , 
i have a for loop with N = 60 , i'm trying to make something when the index (i) reachs specific number , the indecies i'm interested in are
1 ,5 , 9,13, 17, 22, 26, ,30,34,38,43,47,51,55,59
the difference is 4 in some of them but it changes to 5 @ 22 and 43 and come back to 4 in between .
can anybody help me pick up these indecies ?

Hi bmemq,
You can do this with the Equal? function found in the Comparison palette. You would have one Equal? function for each index that you're interested in- one input would be a constant of that number and the other input will be the index terminal of the for loop. Next, you can you a Compound Arithmetic found in the Boolean palette. The number of inputs of the Compound Arithmetic can be expanded to match the number of indices that you're interested in, and each input will be the output of an Equal? function. Finally, the output of this Compound Arithmetic will be in the input of the selector in a Case Structure where you will have a true and false case to toggle the Boolean. 
Josh Y.
Applications Engineer
National Instruments

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    -Z
    Message Edited by zskillz on 10-20-2006 11:49 AM
    Attachments:
    daq01v1MODv2.vi ‏63 KB
    daq01v1MODpic.JPG ‏116 KB

  • How do i configure a FOR loop to have the behavior of the step Loop Type: Pass/Fail count?

    Hello,
    I'm using the Pass/Fail count set to one Pass to capture an event generated by my DUT.  I originally used a numerical compare step with the Looping type of Pass/Fail count to accomplish this.  Unfortunately the implementation changed and now I need to execute a few steps that can not be combined within one code module as before. Nor can these steps be put into a subroutine.  One of the steps executes a .NET asembly and I haven't figured out how to pass the reference to the subroutine.  When the subroutine is intered the reference is lost and the methode does not execute correctly.
    I have an evaluation function the exits the loop when the expected conditions are met. Everything works except for the Overall Pass/Fail result of the For loop.  If the loop exits due to the first numerical compare test passing, I want the loop overall execution to report as "Passed".  If the loop reaches it's predetermined number of iterations, the overall result needs to report as "Failed".  It would also be nice to have the radio button functionality of "Record Result of Each iteration".  Some conditions require a wait over a minute for the event to occur and I don't want to generate needless data for the report.
    Currently I get the pass/fail status for each For loop iteration, but only "Done" for each loop iteration.  I don't want the initial few failures to cause the test to fail.
    Does anyone know how to do this? Suggestions?
    Thanks,

    I have 2 steps in the loop that can not be combined into one step. This forces me to implement the behavior in some form of loop.  A While Loop could be an option.  I would need to pass the Step.Result.Status from the Multiple Numerical compaire step to the condition of the While Loop.  I tried to use the Step.TS.ID without success.  Some form of reference to the numerical compare step would be needed. I'm using a For Loop as I do want to limit the number of iterations of the loop.  In the case where the loop iterations are reached, the event I am trying to detect did not occur at the correct time and a failure needs to be reported.
    I came up with something based on my comments in the second post:
    1) To start with I configured a Locals.ForLoop_5 variable.  This is used to set the limit on the loop iterations and for comparison after the loop has finished executing. More on that later.
    2) The first step inside the loop invokes a method within a .NET assembly that has been packed in a DLL This method gets the required data from the DUT and stores it to a text file.
    3) The next step is the Multiple Numeric Limit step.  This step invokes a VI that extracts the data from the text file.  This step has been customized in several ways.
      i)  In Run Options, the Results Recording Option was disabled.  This prevents recording of "Failed" while the loop executes when waiting for the event to happen.
      ii) In Run Options, the Step Failure Causes Sequence Failure is unchecked.  Same reasoning as i)  These steps are not true failures.
      iii) A Post Action is configured to go to the nexxt step after the For Loop End step On Condition True with the logic of Step.Result.Status == "Passed".  This causes the loop to exit when the first "Passed" is encountered which corrolates with the event I'm trying to detect. On Conditon Fail remains set to default.
    4)  The step after the For Loop End is an expression step with everythin set to default except for the Status Expression logic set to: Locals.Loopindex < Locals.ForLoop_5 ? (Step.Result.Status = "Passed") : (Step.Result.Status = "Failed"). This step performs the overall Pass/Fail reporting for the For Loop.  If the number of loop iterations is less than the maximum it could have only gotten there by the previous logic triggered by the numerical compare passing, therefore "Passed".  If the loop index has reached the limit, then the event was not detected, therefore Failed.
    I have tested this work around with success, it just a pain to now have to implement this on my 40 some odd For Loops.
    If there is a better way, I'd still like to hear it.

  • How do I break a for loop (inside) and a while loop (outside) at the same time by a control button

    I have a while loop (outside) and a for loop (inside) and a control button within the for loop.  I want to stop the program by click the botton without finishing the for loop.  How can I do that?
    Thank you in advance.

    HI Please find attached snapshot Regards, Santosh
    Message Edited by SanRac on 12-17-2009 05:12 AM
    Message Edited by SanRac on 12-17-2009 05:13 AM
    Attachments:
    Snap1.png ‏4 KB

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