[R] a loop for boxplot graphs

[Coen van Hasselt]

You could use the paste() function to dynamically assign label values.
For instance, like this:

dat<-data.frame(id=1:4,x=1:4,y=1:4)
par(mfrow=c(2,2))
for (i in dat$id){
boxplot(dat$x[dat$id==i],
	  dat$y[dat$id==i],
	  main=paste("Results for Subject",i) )
}

There might be a better answer though- e.g. avoiding a for-loop.


Coen


On Mon, Mar 30, 2009 at 07:08, James Lenihan <jameslenihan at sbcglobal.net> wrote:
>
> Dear Colleagues
>
> I have the following code that generates a boxplot for one specific labtest:
>
> boxplot.n(LBSTRESN~COHORT, main="Boxplot of laboratory data for XLXXX-XXX test=Creatinine",
> subset = LBTEST=="Creatinine",
> xlab = "Cohort Number",
> ylab = "Units = umol/L",
> varwidth=TRUE
>
> I would like to know if there is a way to loop through the dataset and produce the boxplot for a number of specific labtest.
>
> Looking at the documentation for loops I can't see how I would change the "ylab","main"and "subset"
>
> Can someone refer me to a similar example in the online documentation?
>
> Thanks,
>
>
> Jim L
>        [[alternative HTML version deleted]]
>
>
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