[R] Histograms per coding variable - labelling the plots

[Ben Bolker]

  The best I can do is a bit of a hack, really a for loop in disguise:

f <- factor(rep(LETTERS[1:10],rep(10,10)))
tmp <- split(a,f)

par(mfrow=c(3,4))
sapply(1:length(tmp),function(i)hist(tmp[[i]],main=names(tmp)[i]))

  If anyone has a better idea ...
  I've often wished for a "MapThread" (cf. Mathematica) or "zip" function
or something similar that would apply a two- (or more-) parameter function
to parallel lists/vectors.  One could write one's own in R code, but I
don't know that there would be any real advantage beyond elegance.



On Thu, 6 Dec 2001, Smit, A, Albertus, Dr wrote:

> Dear all
>
> Thank you to all who replied to the question regarding plotting
> histograms for a series of coding variables.  The tapply() function
> seems to work well, and so does the lattice package.
>
> Kaspar Pflugshaupt also pointed out the following:
>
> > With some tricks, you can even have a title with the respective label over
> > each plot... but I forgot how I did this.
>
> Does anyone know how to do this?
>
> Thank you again,
> Albertus
> Dr Albertus J. Smit
> Department of Botany
> University of Cape Town
> PO Box Rondebosch
> 7700
> SOUTH AFRICA
> Tel. 689 3032
> Fax. 650 4041
>
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