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'
Make the vector [1 2 3 4 5 6 7 8 9 10]
Make a checkerboard matrix
Fahrenheit to Celsius converter
Replacing a row
Let's get back to school: create mixed numbered fraction
Matrix to column conversion
User defined nextpow function
Matrix rotation as per given angle
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