Difference between revisions of "SigmaXY Command"
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Revision as of 15:23, 27 February 2011
- SigmaXY[List of x-Coordinates, List of y-Coordinates]
- Calculates the sum of the products of the x- and y-coordinates.
- SigmaXY[List of Points]
- Calculates the sum of the products of the x- and y-coordinates.
- Example: You can work out the covariance of a list of points using
SigmaXY[list]/Length[list] - MeanX[list] * MeanY[list].
