How to find the position of an element in a vector without using the find function
matrix of natural number
factorial of a number x
Remove the first, third and fifth rows of a matrix
Variance computation (★)
Extract leading non-zero digit (★★★★★)
Swap the first and last columns (★★)
Remove the row average (★★★)
Mo money, mo math #2! (★★★)
Make a checkerboard matrix (★★★★★)
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