[R] creating new vector

Peter Dalgaard p.dalgaard at biostat.ku.dk
Fri Mar 10 11:33:03 CET 2006

Amir Safari <amsa36060 at yahoo.com> writes:

>     Hi R Users, I don't know how much is difficult my problem and
>   even it is possible to solve in R or not. Given a vector with 2000
>   observations. I want to creat a new vector from that vector so
>   that new vector be the sum of every 5 observations sequently. That
>   is , each new observation is sum of every 5 sequent observations,
>   from the first observation of previous vector to the end. So new
>   vector must include 500 observations. My effort did not work in R.
>   Do you have any way? Thanks a lot for any help. Amir

Er, 5*500 != 2000... Did you mean "sum of 4" or "400 obs. in the new
vector"? Anyways, how about 

colSums(matrix(myvector, nrow=5))


   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907

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