I have a large matrix and I want to extract different sub-matrices that actually have elements on different positions. Using Extract
and mention the position of every element is quiet tedious and will take too much time to type.
What command can I use to extract the required elements? For example I want to extract 2*2 matrix with these elements
{{[[1, 1]], [[1, 9]]}, {[[9, 1]], [[9, 9]}}
Is there another way where I don't have to specify the position of the elements repeatedly?
[...]
s in nested{...}
s? As far as I know, it does not make sense in Mathematica. $\endgroup$ – Αλέξανδρος Ζεγγ May 27 '18 at 12:39