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'
Find the alphabetic word product
Add a row of zeros on top of a matrix
Compare two input matrices
User defined nextpow function
Create a v-notch vector without "sort" function
Who is the baby and who is the daddy in this family?
Matrix multiplication across rows
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