extension to plot.formula?

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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