Extracting values in a matrix

[LUBR]

Hello.

I am trying to extract values from a matrix according to certain restrictions, with no success! In the file attached is the attempt. Any help would be greatly appreciated. 

[MartinHanak]

See https://community.ptc.com/t5/PTC-Mathcad/Allocate-a-Variable/td-p/582812

[LUBR]

Hi.

Thank you, but I think I wasn't very clear. This is what I am trying to do:

[LucMeekes · Accepted solution]

From a quick observation:

You can remove i from your program altogether, and use j to index r.

But the problem lies in the fact that only the first if statement is within the for loop.

I think you want all three if statements in that loop.

Success!
Luc

[LUBR]

Thanks a lot, Luc!

It worked!

[AlanStevens]

You can use the logic operators as follows:

Alan

[LUBR]

Thanks, Alan. It's simpler this way!

[Werner_E]

Here are some more ways using vectorized function calls: