Hi:

Look into the rollmean() function in package zoo.

HTH,
Dennis

On Fri, Oct 15, 2010 at 12:34 AM, David A. <dasolexa@hotmail.com> wrote:

>
> Hi list,
>
> I have a 1710x244 matrix of numerical values and I would like to calculate
> the mean of every group of three consecutive values per column to obtain a
> new matrix of 570x244.  I could get it done using a for loop but how can I
> do that using apply functions?
> In addition to this, do I have to initizalize a 570x244 matrix with 0's to
> store the calculated values or can the output matrix be generated while
> calculating the mean values?
>
> Cheers,
>
> Dave
>
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