# LabVIEW

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## Combination of input paths/strings

Hello,

I would like to improve my VI. Its something like AB subjective assesment of sound quality. The issue is, that the combination od stimulis must be prepaired as pairs. I would like to code the combinatory in app itself. So the point is to make pair combination of input paths or strings (array) and that combination is without repetition. Mathematicaly its for n files n!/2!*(n-2)!. I started programming that in LV, but it was too complex, more than the main VI. I´ve been doing that for 2 hours and finally I did not accidentaly save it. So now I´m quite upset. But anyway, that code was rubbish. Do you have any idea how to solve that?

Thank you very much!

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## Re: Combination of input paths/strings

This should work for combinations of two things. This can be extended to solve more than two with recursion. This could be written to run faster, as written there are many array copies being made.

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## Re: Combination of input paths/strings

I did it exactly like you had posted it. But not working.

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## Re: Combination of input paths/strings

Hello Kulovy,

I post a working example that might should solve your problem. Please reshape it to fit your application.

Regards, TRSns

Piotr Kruczkowski
Certified TestStand Architect
Certified LabVIEW Architect
Message 4 of 10
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## Re: Combination of input paths/strings

Hello TRSns,

thank you for giving me this idea! It took me quite long time to manage how to do it my way. So here is the result. You can see it´s nothing simple, but maybe it´s not the best way to do it. I know that in sequence languages it would be 5 lines of code or so 😄

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## Re: Combination of input paths/strings

It would make much more sense to attach a VI or snippet. We cannot debug and judge an image.

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## Re: Combination of input paths/strings

Ouch I did´t know thats something like snippets in LV, so here it is:

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## Re: Combination of input paths/strings

Hi,

if you bundled the input values in stead of building a string from them, it would be a lot easier to remove invalid array fields. You would simply check which array fileds have a cluster with NAN value, and remove them (not use them). At the same time you could build a 1-D array with a while loop and shift register, from the clusters that do not have NAN values.

Hope that helps, RavenBlack (aka TRSns)

Piotr Kruczkowski
Certified TestStand Architect
Certified LabVIEW Architect
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Solution
Accepted by topic author Kulovy

## Re: Combination of input paths/strings

Try something like this:

(I generate the pair indices in seperate code, so it later can be used on any list (filenames, etc.). This is just a quick draft, many improvements are possible.)

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## Re: Combination of input paths/strings

Wow, simplicity at the best! Thank you altenbach!

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