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How do some array operation work?


bublina

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I have noticed, that some array operations come for free in some cases, e.g. do not cost any resources, such as: reverse, transpose, reshape. Since the array representation in memory is like:

 

dimension1

dimension2

...

dimensionx

data

 

I can see how things like reshape are for free, but how does for example reverse happen? Does LabVIEW keep these as flags in places with data or does the compiler just know that the next loop should start from back?

Edited by bublina
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I always heard transpose was "like a no-op" because it didn't move the data around, it just swapped pointer to the memory.  If that were the case I could see why a reshape would also be free because the memory it self doesn't need to change just the way the data is interpreted.  That being said I have no source stating a transpose is a free operation.

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