[R] Partial sum of a vector

[jim holtman]

?filter

> x
 [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
> filter(x, rep(1,4))
Time Series:
Start = 1
End = 20
Frequency = 1
 [1] NA 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 NA NA


On Sun, Mar 1, 2009 at 9:29 PM, Mohammad Sabr <mohammad_sabr at 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
>        [[alternative HTML version deleted]]
>
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?