Rotate a Matrix by 90 degrees
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Compute LOG(1+X) in natural log
Determine the mean of matrix
Matrix of almost all zeros, except for main diagonal
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
vectorization in N
First non-zero element in each column
Remove NaN ?
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