nested iteration(?!)

[SudiptaDas]

Hello fellow programmers,
Following is the challenge I'm trying to solve:
I have 2 arrays : WL-Reference & WL-Actuatorscan. Length of WL-Actuatorscan is higher than that of WL-Reference. I'd like to iterate through WL-Reference, and for each element of that array I'd like to find all the values from WL-Actuatorscan that fall within a certain tolerance around that element of WL-Reference and then group them together.
If it was Python, I'd do something like (pseudocode):
for elementRef in WL-Reference:

     for elementActuator in WL-Actuatorscan:

           if elementActuator < elementRef + tolerance OR elementActuator > elementRef - tolerance:

               append elementActuator into a data structure

I'd like to do the same in LV. I've attached the project in a zip file alongside 1 set of example data files. Open the FindOptimisedMicrometerPositionOfLaserLine.vi for troubleshooting. If anyone of you have an idea, could you please fiddle around with the code and see if it works. I still consider myself a novice LV programmer, so I'd appreciate if you could add the code snippet and a little explanation with your suggestions.

Thank you so much in advance 🙂

[RTSLVU]

I think this is what you want?

[GerdW]

Hi,

I would place a bundle node after the conditional output tunnel of the inner loop as the resulting 1D arrays probably can/will have different lengths.

The output of the outer loop will change to an array of cluster of array - in LabVIEW in a 2D array all rows will have the same length!

[SudiptaDas]

Thank You!
Not quite what I wanted. However, you gave me enough clue to figure out how to get what I wanted 🙂 See below

Happy coding y'all 🙂

[GerdW]

Hi das,

what's the point in inserting into an empty array?

[SudiptaDas]

Because it gives me a nice 2D array of reference and detected values:

I don't really know if that's the best way to do it. Perhaps some of my Pythonic practices are spilling over to LV codes. If you have a better idea, please play with the code; its attached. Please note that the code has compounded a fair bit by now.

[crossrulz]

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@SudiptaDas wrote:

Because it gives me a nice 2D array of reference and detected values:

I don't really know if that's the best way to do it. Perhaps some of my Pythonic practices are spilling over to LV codes. If you have a better idea, please play with the code; its attached. Please note that the code has compounded a fair bit by now.

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The output tunnel from the FOR loop already gives you that.  Just remove the Insert Into Array and wire the terminal directly to the FOR loop's tunnel.

[Lavezza]

FYI, in your pseudocode you have if elementActuator < elementRef + tolerance OR elementActuator > elementRef - tolerance

But your LabVIEW code is set to include the lower limit, so it is equivalent to if elementActuator < elementRef + tolerance OR elementActuator >= elementRef - tolerance

Maybe that's fine. But if you want to change it, right click on the In Range and Coerce node and uncheck Include lower limit.

[altenbach]

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@SudiptaDas wrote:

I don't really know if that's the best way to do it. Perhaps some of my Pythonic practices are spilling over to LV codes. If you have a better idea, please play with the code; its attached. Please note that the code has compounded a fair bit by now.

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I agree that your array handling needs some serious work. Let's have a look how you read your file (only the first part shown).

[altenbach · Accepted solution]

Here's how you could do the file reading, for example: