Column and row-wise variances and standard deviations of a matrix

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`x` |
A matrix with the data. |

`suma` |
If you already have the column sums vector supply it, otherwise leave it NULL. |

`std` |
A boolean variable specyfying whether you want the variances (FALSE) or the standard deviations (TRUE) of each column. |

We found this in stackoverflow and was created by David Arenburg. We then modified the function to match the sums type formula of the variance, which is faster.

A vector with the colum variances or standard deviations.

Michail Tsagris

R implementation and documentation: Michail Tsagris <mtsagris@yahoo.gr> and Manos Papadakis <papadakm95@gmail.com>.

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