How to obtain irregular submatrix for .oct files

[pauljoseph]

Hi,

is there anyway to extract a submatrix but with irregular rows and columns.
I know we can use "extract", but this assumes from left corner to right
corner. What I want is something like this in octave:

%create 5x5 random matrix
A=rand(5);
idx=[1,3,5];
B=A(idx,idx);

How to do it if I write a C++ code for .oct file? thanks in advance.
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