Check if matrix A is nilpotent.
May I ask what is the definition of Nilpotent matrix. I suppose that is A^k =0 for some k? If I am right, then 0 must be an eigenvalue of A, then there is some issues for the test problems.
Matrix indexing with two vectors of indices
Sum the elements in either diagonal of a square matrix
Add two numbers
Create a two dimensional zero matrix
Length of a short side
Sum of series V
Sum of series VI
Sum of series II
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