For a given input string str, find how many spaces are there in the string and replace those spaces with *
e.g. str = 'this is demo of replacing spaces with stars';
out = 'this*is*demo*of*replacing*spaces*with*stars'
Remove the polynomials that have positive real elements of their roots.
Sum the Digits of a Number
05 - Vector Equations 1
Length of a short side
Matrix multiplication across rows
Matrix to column conversion
Back to basics - mean of corner elements of a matrix
Create an index-powered vector
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