Make a checkerboard matrix
Back to basics 12 - Input Arguments
Back to basics 22 - Rotate a matrix
Multiply a column by a row
Is this triangle right-angled?
Create a matrix X, where each column is a shifted copy of the vector v
First non-zero element in each column
Duplicate each element of a vector.
A quadrant matrix
Matrix which contains the values of an other matrix A at the given locations.
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