[R] extension to plot.formula?

[Liaw, Andy]

This is typically done with matplot(x, cbind(y1, y2), ...), so there's only
one line of code needed.  Perhaps you want a formula interface for matplot?

Andy

> -----Original Message-----
> From: Adrian Baddeley [mailto:adrian at asteridia.maths.uwa.edu.au] 
> Sent: Monday, June 16, 2003 5:53 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] extension to plot.formula?
> 
> 
> Could I suggest the following extension to plot.formula:
> 
>       plot(cbind(y1,y2) ~ x, ...)
> 
> should plot (y1 against x) and (y2 against x) on the same plot.
> 
> The default y axis limits would be determined by the range of 
> c(y1,y2). 
> 
> This would be pretty handy sometimes, replacing 4 lines of code.
> 
> The current plot.formula evaluates cbind(y1,y2), which is a 
> matrix, so plot.formula looks for "plot.matrix", in vain, 
> then calls plot.default which gives an error because 
> length(cbind(y1,y2)) is greater than length(x).
> 
> I suggest that plot.formula be changed to recognise the 
> situation where there is more than one response variable, and 
> produce multiple superimposed plots in that case. (It already 
> recognises the case where there are multiple non-response variables).
> 
> ----
> Adrian Baddeley, Mathematics & Statistics, University of 
> Western Australia
> 		<http://maths.uwa.edu.au/~adrian/>
> 
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> 

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