[R] simple graph question: manipulating variable names

Rolf Turner r.turner at auckland.ac.nz
Wed Aug 26 05:21:28 CEST 2009


On 26/08/2009, at 3:08 PM, Donald Braman wrote:

> This is a simple problem that has stumped me: I'm trying to loop  
> through a
> few dozen variable names in graphs.  I've tried various approaches  
> like
> this:
> attach(mydata)
> ivs <- c("oneiv", "anotheriv", "yetanotheriv")
> dvs <- c("onedv", "anotherdv", "yetanotherdv")
> for (iv in ivs) {
> for (dv in dvs) {
> graphname <- paste(iv, dv, ".png", sep = "")
> png(file=graphname, width=300, height=300)
> plot(dv ~ iv, pch=".")
> lines(loess.smooth(iv, dv), lty=1)
> dev.off()
> }
> }
>
> Clearly that doesn't work.  I'm not sure how to make R see the iv  
> and dv
> strings as variables.  Advice?

?get

	cheers,

		Rolf Turner

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