[R] Histograms per coding variable - labelling the plots

[Kaspar Pflugshaupt]

On 06.12.2001 16:22 Uhr, Smit, A, Albertus, Dr wrote:

>> 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?

Well, i dug it up again. At that time, I really tried to avoid for() loops,
no matter how complicated the resulting code :-) .
Here goes (a simplified example):

par(mfrow=c(2, 1))
d.f <- data.frame(l=rep(c("A", "B"), 4), a=1:8)
labels <- levels(d.f$l)
nlab <- length(labels)
# and the "piece de resistance":
sapply(1:nlab, function(x) hist(d.f$a[d.f$l==labels[x]], main=labels[x]))

This also prints out hist()'s textual output. If you don't want that, put
invisible() around the whole line.

On the whole, the solution with for() that Michael Miller posted is more
readable...

Cheers

Kaspar 

-- 

Kaspar Pflugshaupt
Geobotanisches Institut
Zuerichbergstr. 38
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