Re: [R] storing output data from a loop that has varying row numbers

From: Joris Meys <jorismeys_at_gmail.com>
Date: Tue, 01 Jun 2010 15:38:00 +0200

There's something very unlogic in your code. You have the whole time the same datafra

On Tue, Jun 1, 2010 at 1:51 PM, RCulloch <ross.culloch_at_dur.ac.uk> wrote:

>
> Hi All,
>
> I am trying to run a loop that will have varying numbers of rows with each
> output.
>
> Previously I have had the same number of rows so I would use (and I
> appreciate that this will no doubt achieve some gasps as being thoroughly
> inefficient!):
>
> xdfrow<-(0)
> xdfrow1<-(1:32)
> xdfrow2<-(33:64)
> xdfrow3<-(65:96)
> xdfrow4<-(97:128)
> xdfrow5<-(129:160)
> xdfrow6<-(161:192)
> xdfrow7<-(193:224)
>
> and so on....
>
> xdf <- matrix(999, nrow=1024, ncol=7)
> xdf <- as.data.frame(xdf)
> NAM <- c("NAME","ID2","DAY","BEH", "B_FALSE", "B_TRUE","TOTAL")
> colnames(xdf)<-NAM
>
> I then use this matrix and then run the loop and assign the data to each of
> the xdfrows just doing +1 on each loop. (If that makes sense? Not really
> important, just trying to show that I do try and solve some of my own
> problems, albeit perhaps not in the best manner!)
>
> _________
>
> However, the data I'm working with now has a very varied number of rows
> (0:2500) over a large data set and I can't work out how is best to do this.
>
> So my loop would be:
>
> for (i in 1:33){
> SEL_DAY<-seal_dist[seal_dist[,10]==i,]
> print(paste("DAY", i, "of 33"))
> for (s in 1:11){
> SEL_HR<-SEL_DAY[SEL_DAY[,5]==s,]
> print(paste("HR", s, "of 11"))
> indx <- subset(SEL_HR, SEL_HR$DIST == 0)
> SEL_HR$TO_ID <- indx$ID[match(SEL_HR$TO, indx$TO)]}
> }
>
> where i is day and s is the hr within the day, the loop works fine because
> it prints as i expect it too. I have not given any info on the data because
> I assume this is more of a method question and will be very straight
> forward
> to most people on here!? But I am happy to post data if it is needed.
>
> I assume I need to set up a matrix before the loop,
>
> e.g. DIST_LOOP<-matrix(NA,1000,ncol=11)
>
> and then I should be able to put something before the first } that allows
> me
> to add to the matrix, but everything I have tried doesn't work
>
> e.g. DIST_LOOP[[i]]<-SEL_HR
>
> Any help would be much appreciated,
>
> Best wishes,
>
> Ross
>
>
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/storing-output-data-from-a-loop-that-has-varying-row-numbers-tp2238396p2238396.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help_at_r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
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>

-- 
Joris Meys
Statistical Consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

Coupure Links 653
B-9000 Gent

tel : +32 9 264 59 87
Joris.Meys_at_Ugent.be
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Received on Tue 01 Jun 2010 - 14:01:57 GMT

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