Display positive elements of matrix.
Remove all the consonants
07 - Common functions and indexing 6
Multiply by 3
Create a vector
Find cosine between two given vectors u and v.
Form a square matrix from four square sub-matrices
Convert array of decimal numbers into hexadecimal numbers array.
Calculate the sum of elements of n*n Hilbert matrix.
Set x value to each even index of vector y.
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