Although I am very satisfied with this feature, I have to agree with Martin. It might be a bit confusing this way, because the row-wise indexing for matrices as indexes is more expected than column-wise.

Regards,
Radovan

..Probably I ma stupid but I haven't clearly understood the syntax of the command and how to use it ( ..and so the Andrey's examples) .

If there is someone that can take a moment to explain this , it would be very appreciated

Best regards

Franco

Hello Franco,

Just play with this a bit, and you will figure out

Extract Matrix with matrix indices

Regards,
Radovan

Wrote

I hoped this might be the most simplest way.

Not so easy ! At the machine code, everything is linear.
That's what the "ct" counter does system wise, then returned
math style. Just a bit more about Delta matrix. The JPG
explanation is short, just the principle of it. There is lot
more behind the scene.

Jean



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Wrote

The sandbox example shows the use of matrices as indices. The question is, how the rules for such indices are.

A straightforward rule would be that whatever you provide as index structure, it is accessed by linear indexing from 1..length() of the index structure.

The following example shows that the actual behaviour is different. The index matrices are indexed column-wise and not row-wise as the usual linear indexing works.

I propose to change this in order to be consistent with general linear indexing.

Thank you! Fixed by Davide.

Best regards.