Replace NaNs with the number that appears to its left in the row.
Return unique values without sorting
Duplicate each element of a vector.
length of a vector
Average of corner elements of a matrix (★★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
Vector of digits (★★)
Generate n equally spaced "intervals" between -x and x (★)
Matrix indexing with two vectors of indices (★★)
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