Message-ID: <428339FF.5030907@statistik.uni-dortmund.de>
Date: 2005-05-12T11:11:59Z
From: Uwe Ligges
Subject: Plot()
In-Reply-To: <000101c556d8$d2ba5a40$6233418d@oesa.leipzig.ufz.de>
Ute Visser wrote:
> Hello!
>
> I wonder why the x and the y expression are treated differently in the
> plot-function?
> In the example below I should get three times the same graph, shouldn't
> I?
>
> column<-c(0,1)
> par(mfrow = c(3,1))
> plot((1-column)~column)
> plot(column~(1-column))
In right hand sides of formulas you have to use I() in order to do these
calculations:
plot(column ~ I(1-column))
or plot() will simply plot against the index (column ~ 1) and ignores
the unsensible last part "-column".
Uwe Ligges
> plot(column~as.vector(1-column))
>
> Thanks for checking!
>
> U
>
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