Dear Damien,
> -----Original Message-----
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of damien landais
> Sent: Friday, June 26, 2009 11:16 AM
> To: R-help@r-project.org
> Subject: [R] to raise in a loop more than 1
>
> I would raise x,y and z in a loop but I won't raise of 1. I
> tried this but it doesn't work
>
> mydata=matrix(nrow=1500,ncol=3)
> i=1
> for(x in 0:10){
> for(y in 0:20){
> for(z in 0:10){
> mydata[i,]=c(x,y,z)
> i=i+1
> z=z+2}
> y=y+4}
> x=x+2}
>
> And I would have something like that
> x y z
> 0 0 0
> 0 0 2
> 0 0 4
> 0 0 6
> 0 0 8
> 0 0 10
> 0 4 0
> 0 4 2
> ...
>
I am not exactly sure what you want. If my guess is correct, this will
reproduce the desired output:
x <- seq(from=0, to=10, by=2)
y <- seq(from=0, to=20, by=4)
z <- seq(from=0, to=10, by=2)
mydata2 <- expand.grid(x=as.factor(x), y=as.factor(y), z=as.factor(z))
mydata3 <- with(mydata2,
mydata2[order(x,y,z),]
)
head(mydata3, n=8)
Hope this helps,
Roland
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