[R] Parameterising apply To Compute Rolling Average of Columns in a matrix

[Gabor Grothendieck]

On Wed, Nov 17, 2010 at 2:27 PM, Paolo Rossi
<statmailinglists at googlemail.com> wrote:
> I sent a post to find a clever way to compute a Rolling Average of columns
> in a matrix  and I was given the solution below which I am very pleased
> with.
>

There is a zoo function that does this.  The following converts a to
zoo, performs the rolling average on columns and then converts back to
a matrix.  (A zoo object is just a matrix with a time index.)

library(zoo)
coredata(rollmean(as.zoo(a), 7))

Depending on what this is part of, you might be better off to keep it
as a zoo object since then you have access to all the other facilities
as well.

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