Given the vertices in vectors X,Y, return the area of the polygon they define.
Back to basics 1 - Saving
Is the Point in a Triangle?
Rotate a Matrix by 90 degrees
Removing rows from a matrix is easy - but what about inserting rows?
Geometrical meaning of determinant
Performance - summation
Probabilities - Balls and urns - 02
Non trivial identities - summation
Find the diagonal of the square of side L
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