Replace NaNs with the number that appears to its left in the row.
Determine Whether an array is empty
Add two numbers
Make a 1 hot vector
Reverse a matrix
Vector raised to a power, element-wise (★)
Create a vector of the first n natural numbers (★)
Remove the row average (★★★)
Mo money, mo math #2! (★★★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
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