Find sum of negative elements in row.
Example x=[1 -5 3 4 -6 6 7 8 9 10]
result = -11
Reverse the vector
Back to basics 21 - Matrix replicating
Sum of diagonal of a square matrix
Set x value to each even index of vector y.
Count given word x in text.
Find hen's weight.
Convert array of decimal numbers into binary numbers array.
Replace x value into y value in string text.
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