random picture with random colours
Convert a vector into a number
Sophie Germain prime
find the maximum element of the matrix
Find the elements of a matrix according to a defined property.
First non-zero element in each column
Matrix with different incremental runs
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Create a matrix X, where each column is a shifted copy of the vector v
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