[R] A sample question
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Tue Apr 30 23:00:34 CEST 2002
"Ambrosini Alessandro" <klavan at tiscalinet.it> writes:
> Hello.
> Given a vector 1 3 4 2 8 9 5
> I want to obtain a vector with all 0 except in the second position and in
> the fifth, where the numbers are the same of the first vector.
> The new vector must be
> 0 3 0 0 8 0 0
>
> Thank you very much.
> Excuseme but my mind is out of order.
> Alessandro
y <- x
y[-c(2,5)] <- 0
or
y <- ifelse(1:7 %in% c(2,5), x, 0)
or
y <- rep(0,length(x))
y[c(2,5)] <- x[c(2,5)]
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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