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'
Count from 0 to N^M in base N.
First N Perfect Squares
random picture with random colours
Compute a dot product of two vectors x and y
Replace multiples of 5 with NaN
Matrix rotation as per given angle
Back to basics - array operations
Create a matrix with difference of each row of input matrix
Given an input string, generate a variable name out of it
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