2D subset of 2D array

[altenbach]

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@thehun wrote:

I guess you are right that the input array must have some strange flaw. When I try with a short 2x10 array your solution works, but not with the default 2x350k array...very weird

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That makes absolutely no sense. An array is an array is an array.

Could it be that your wired indices are e.g.  NOT I32? What is their datatype?

Are the dimensions different that what you think they are?

I also noticed that your array containers are not at the origin, so watch out for that.