[R] using by to plot

[Peter Malewski]

I do not think that you are looking for this:
xx <- data.frame(x=rnorm(100),y=rnorm(100),p=1:4)
by(xx,xx$p,function(x){par(new=T);plot(x$x,x$y,pch=x$p)})

this dosn't make sence. Perhaps you are looking for:

plot(xx$x,xx$y,pch=xx$p)
p.



On Tue, Aug 28, 2001 at 11:14:37AM -0400, David White wrote:
> 
> 
> Hello,
> 
> I would like to use by to create a series of plots, but I'm not sure how
> to design the function.
> 
> Here's what I've got:
> 
> 1. A data frame of observations of measured value 2 measured vlaues and a
> pch code.
> 
> V1    V2   pchCode
> .0045 123  1
> .0034 145  2
> .0045 123  1
> .0046 167  3
> ...
> 
> So what I want to do is create a single scatterplot of the multiple
> conditions (specified by pchCode) and use pchCode to specify the plotting
> character within the plotting function.
> 
> I'm imagining something like
> 
> by(df, pchCode, function(x) plot(V1, V2, pch=pchCode))
> 
> What I don't know how to code is:
> 1. getting the pch to be defined by the pchCode
> 2. specifying that par(new=TRUE) within the by command.
> 
> Thanks for you suggestions,
> 
> Best,
> 
> David
> 
> 
> S. David White
> sdavidwhite at bigfoot.com
> Columbus, Ohio
> 
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P.Malewski, Limmerstr.47, 30451 Hannover, 0511-2135008
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