Set x value to each even index of vector y.
Find the sum of the elements in the "second" diagonal
Determine the number of odd integers in a vector
convert matrix to single column
Change string to number
Display positive elements of matrix.
Solve expression I
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Delete x value in given vector y.
Pointwise multiplication of vectors.
Solve expression II
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