[R] creating an output file name using cat

[Thomas Lumley]

On Mon, 1 Apr 2002, dstierman wrote:

> I am having problems trying to create file names using the cat function. I
> have an array of column headers, called cnames[] that I want to use as part
> of a jpeg output file. Here is the basic code I am using:
>
> data<-read.csv("inputfile.txt")
> cnames<-colnames(data)
> for(i in 9:dim(data)[2]) {
> 	...
> 	jpeg(file=cat("data",cnames[i],".jpg",sep=""), width=800,
> height=400, bg="white")
> 	...
> }
>
> I get the following error with this code:
>
> R is cool->     jpeg(file=cat("data",cnames[i],".jpg",sep=""), width=800,
> height=400, bg="white")
>
> ERROR:
> dataGL.jpgError in X11(paste("jpeg::", quality, ":", filename, sep = ""),
> width,  :
>         unable to start device JPEG
> In addition: Warning message:
> could not open JPEG file `'
>
> Does anyone have an idea on what is wrong?

Yes. The function you want is called paste(), not cat().

	-thomas

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