Difference between revisions of "SigmaXY Command"

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; SigmaXY[List of Points]: 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 <code>SigmaXY[list]/Length[list] - MeanX[list] * MeanY[list]</code>.}}
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:{{Example|1=You can work out the covariance of a list of points using <code>SigmaXY[list]/Length[list] - MeanX[list] * MeanY[list]</code>.}}

Revision as of 14:49, 18 April 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].
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