Most nonzero elements in row
Extract leading non-zero digit
Replace NaNs with the number that appears to its left in the row.
Replicate elements in vectors
Kelvin to Celsius
Remove NaN ?
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
First non-zero element in each column
Create a matrix X, where each column is a shifted copy of the vector v
Duplicate each element of a vector.
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