Description Usage Arguments Details Value Author(s) References See Also Examples

Form row and column variances for numeric arrays.

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`x` |
an array of two or more dimensions, containing numeric, complex, integer or logical values, or a numeric data frame. |

`na.rm` |
logical. Should missing values (including NaN) be omitted from the calculations? |

`dims` |
integer: Which dimensions are regarded as ?rows? or ?columns? to sum over. For row*, the sum or mean is over dimensions dims+1, ...; for col* it is over dimensions 1:dims. |

`unbiased` |
logical. Should the estimator of the variance be unbiaised, using '(N - 1)' as a denominator? |

`SumSquares` |
logical. Should the function return only the sum of squares? |

`twopass` |
logical. 'twopass = TRUE' is needed for numerical accuracy if mu >> sigma. |

These functions are equivalent to use of apply with 'FUN = var' with appropriate margins, but are a lot faster.

A numeric or complex array of suitable size, or a vector if the result is one-dimensional. For the first four functions the dimnames (or 'names' for a vector result) are taken from the original array.

Antoine Filipovic Pierucci

From David Brahm on R-Help, inspired from Package "colSums".

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