[BioC] Random Matrices

[Sean Davis]

On Thu, Apr 3, 2008 at 3:06 PM, Matthew R. Helmus <mrhelmus at wisc.edu> wrote:
> Hi,
>  Does anyone know of an R function, code, or extension that makes and
>  stores multiple randomizations of a data matrix quickly? Specifically, a
>  function that maintains the sums of columns (samples), or rows (genes),
>  or both. Those functions I have found are slow for large data matrices.

Hi, Matt.

You'll probably want to give us some code or at least more of a
description of what you are trying to do.  That said, sample() is
useful for doing resampling.  colSums() and rowSums() are optimized
for just those computations.

Sean