Fill array with formula nodewith one line of code

[crossrulz · Accepted solution]

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Bassam_Bijjani wrote:  and I still don't get why you reverse before the loop and after...is it to start splitting the array from the bottom ?

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That is exactly why.  It is a lot more memory efficient and caculationally simpler to do it that way.  Imagine trying to remove element 10 when you have already removed 4 and 6.  It gets weird.  Alternatively, you could use conditional autoindexing tunnels.  Not sure which way would be faster, would have to run some benchmarks to find out.

[BassBijj]

Thanks for the further explanation !

[RavensFan]

As for why the formula node exists in LabVIEW.

Sometimes there are situations where it is easier to program something in a text based language.  If you have a predefined equations, lots of operators and parentheses, various orders of operations, it would be easier to type it as is into a formula node than it would be dropping dozens of primitives on block diagram and getting the order of wiring right.  If it is something that is a time critical operation, it might worth coding it in LabVIEW and debugging it.  I would wrap it up in a subVI to that the code is essentially self contained.

[BassBijj]

I Just want to add for others reading..that searching array output -1 if nothing is found..it helps to understand why you compare to zero.

[BassBijj]

Ok so that answers if formula node are slower to execute. That is one good reason not to use them 🙂

thanks for your support all of you !

[BassBijj]

I used a benchmark VI I found there: http://www.ni.com/example/25532/en/

I executed both solution 10 000 times and repeated 100 to get an average since result vary a lot but it gives a good idea of which one is faster.

Solution with search array and conditional tunnel : 0.0042 s

Solution with deleted from array                            : 0.0272 s