Dear Mohammad,
Take a look at the rollmean function in the zoo package.

HTH,

Jorge

On Sun, Mar 1, 2009 at 9:29 PM, Mohammad Sabr <mohammad_sabr@yahoo.com>wrote:

> I am trying to run a loop where I can sum parts of a matrix. For example, I
> want at each step in the loop to sum the the next 4-values of a vector. I
> tried to do the following but the result were wrong:
>
> for (i in 4:T) {
> data_q[i-3,]=sum(data_m[i-3,]:data_m[i,])
> }
>
> can anyone please direct me on what should I do to run this loop properly
>
> Thanks in advance
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>
>
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