Re: [R] Getting data out of a loop

From: jim holtman <jholtman_at_gmail.com>
Date: Wed 09 Aug 2006 - 08:10:46 EST

Store it in a 'list'; see modified script below:

cata <- c( 3,5,6,8,0, NA)
catb <- c( 1,2,3,4,5,6)
doga <- c(3,5,3,6,4, 0)
dogb <- c(2,4,6,8,10, 12)
rata <- c (NA, 5, 5, 4, 9, 0)
ratb <- c( 1,2,3,4,5,6)
bata <- c( 12, 42,NA, 45, 32, 54)
batb <- c( 13, 15, 17,19,21,23)

id <- c('a', 'b', 'b', 'c', 'a', 'b')
site <- c(1,1,4,4,1,4)
mat1 <- cbind(cata, catb, doga, dogb, rata, ratb, bata, batb)
Df <- data.frame(site, id, mat1)
nn <- levels(Df$id)

Df
nn
rate <- c(2,3,4)

Result <- list()
for (i in 1: length(nn)) {

dd<- subset(Df, id==nn[i])
scat <- sum(c(dd$cata,dd$catb), na.rm=T)
sdog <- sum(c(dd$doga,dd$dogb), na.rm=T)
srat <- sum(c(dd$rata, dd$ratb), na.rm=T)
sbat <- sum(c(dd$bata,dd$batb), na.rm=T)
sss <- c(scat,sdog, srat,sbat) * rate[i] Result[[i]] <- sss
print(sss)
}
Result

On 8/8/06, John Kane <jrkrideau@yahoo.ca> wrote:
>
> A stupid question but I just cannot see how to do
> this.
>
> I have a loop that does some calculations and puts the
> results in a vector for each iteration, but I cannot
> see how to get the data out of the loop in such a way
> that I can use it. I can print it but how do I get it
> into a set of vectors or what ever.
>
> Any help gratefully received. Thanks
>
> Example
>
> cata <- c( 3,5,6,8,0, NA)
> catb <- c( 1,2,3,4,5,6)
> doga <- c(3,5,3,6,4, 0)
> dogb <- c(2,4,6,8,10, 12)
> rata <- c (NA, 5, 5, 4, 9, 0)
> ratb <- c( 1,2,3,4,5,6)
> bata <- c( 12, 42,NA, 45, 32, 54)
> batb <- c( 13, 15, 17,19,21,23)
> id <- Cs(a,b,b,c,a,b)
> site <- c(1,1,4,4,1,4)
> mat1 <- cbind(cata, catb, doga, dogb, rata, ratb,
> bata, batb)
> Df <- data.frame(site, id, mat1)
> nn <- levels(Df$id)
>
> Df
> nn
> rate <- c(2,3,4)
>
> for (i in 1: length(nn)) {
> dd<- subset(Df, id==nn[i])
> scat <- sum(c(dd$cata,dd$catb), na.rm=T)
> sdog <- sum(c(dd$doga,dd$dogb), na.rm=T)
> srat <- sum(c(dd$rata, dd$ratb), na.rm=T)
> sbat <- sum(c(dd$bata,dd$batb), na.rm=T)
> sss <- c(scat,sdog, srat,sbat) * rate[i]
> print(sss)
> }
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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Received on Wed Aug 09 08:15:12 2006

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