[R] plot-parameter pch without influence when plotting a data-frame

[Oliver Bandel]

Zitat von "Gerhard Schön, UKE Hamburg" <G.Schoen at uke.de>:

> what is the result of:
>
> df <- data.frame(x = 1:5, y = 1:5)
> plot(df, pch = 1:5)

It prints different symbols.

It seemed, that my pch-settings had an effect,
but some symbols were very similar, especially, when
a lot of them are plotted at similar places.


But I also had the effect, that some symbol numbers didn't
print enything, but *after* the loop I used, warnings were
printed.

Do you know how to plot very small dots?
 pch=20 makes dots that are too big for my plot.
Is there a possibility to have more detailed control on the symbols?

Ciao,
   Oliver