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Hi,
I have one problem - I want to set vector which is composed of some elements of variance-covariance matrix of residuals. I place example below. I have matrix like above and I need vector with 4 rows filled with elements from the matrix:
-c1,r2/c3,r2
1
-c3,r1/c2,r2
c4,r3/c4,r4

where c and r are columns and rows of matrix which I placed above.

Could anyone give me some advice or the syntax? I really need it.

Thank you in advance.

I cannot follow your notation at all, but in general you can use (i,j) notation: sets the second element of the vector myvector equal to the 3rd row, 4th column element of the matrix mymatrix.

It works!
Thank you :)