[R] Making the plot window wider and using the predict function

PIKAL Petr petr.pikal at precheza.cz
Fri Feb 15 15:23:46 CET 2013

> Hello,
> I am new to R and have a couple of questions. My data set contains the
> variables "Bwt" and "Hwt", which are bodyweight and heartweight,
> respectively, of a group of cats.
> With the following code, I am making two plots, both to be viewed in
> the same plot window in R:
> library(MASS)
>  maleData <- subset(cats, Sex == "M")
>  linreg0 <- lm(maleData$Hwt ~ maleData$Bwt)

The second question is answered by:

linreg0 <- lm(Hwt ~ Bwt, data=maleData)

after that your predict code works.

>  par(mfrow=c(1,2))
>  plot(maleData$Hwt ~ maleData$Bwt)
>  plot(rstandard(linreg0) ~ fitted(linreg0))
> My problem is that the two plots end up all oblong and squashed,
> because the plot window doesn't have a size suited for having two plots
> next to one another. Can I tell R to adjust the plot window?

Can you use mouse for resizing?


> Also, I would like to do something along the lines of:
> newData <- data.frame(Bwt = 3.5)
> predict(linreg0,newData,interval="p")
> This doesn't work - my guess is that to R, "Bwt" is not a variable in
> maleData, but maleData$Bwt is. I could use an attach command, but is it
> possible to get this to work without doing so?
> Kind regards,
> Rasmus Hedegaard.
> 	[[alternative HTML version deleted]]
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