Return x by flipping it.
This question asks to return the flipped input variable, but test for equality with the input variable...
Replace NaNs with the number that appears to its left in the row.
Remove NaN ?
Back to basics 21 - Matrix replicating
Replace May with April
Find the nearest integer
Remove collinear points in a set of 2D points defining a polygon
Non trivial identities - reshape
Performance - summation
Area of polygon
Find the diagonal of the square of side L
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