Set x value to each odd index of vector y.
Generate a string like abbcccddddeeeee
Replace multiples of 5 with NaN
Given a 4x4 matrix, swap the two middle columns
length of a vector
Remove All elements less than 5
Create a square matrix with given conditions
Calculate the sum of elements of n*n Hilbert matrix.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Count given word x in text.
Find hen's weight.
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