NewStats:

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   Calculates the new standard deviation and average.
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   Form:
   [s, m]  = NewStats( oldS, oldM, count, x )
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    Inputs
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    oldS      (:,:)  Old standard deviation of the data set
    oldM      (:,:)  Old average of the data set
    count     (1,1)  Number of elements in data set (including x)
    x         (:,:)  New element that has been added to the data

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    Outputs
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    s         (:,:)  New standard deviation
    m         (:,:)  New average

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Children: