[R] Labelling curves on graphs

[(Ted Harding)]

Many thanks, Matt. for pointing that out. It certainly looks very
promising -- but also there is an awful lot to study! [Pause, while
I head for the coffee-maker]

Ted.

On 16-Jul-08 20:31:44, Austin, Matt wrote:
> Dr. Harrell's Hmisc package has labcurve.
> 
> --Matt
> 
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Ted Harding
> Sent: Wednesday, July 16, 2008 1:17 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Labelling curves on graphs
> 
> Hi Folks,
> I'd be grateful for good suggestions about the following.
> 
> I'm plotting a family of (X,Y) curves (for different levels of another
> variable, Z): say 6 curves in all but could be more or less -- it's a
> rather variables situation.
> 
> I'd like to label each curve with the value of Z that it corresponds
> to.
> 
> The problem is that the layout (shapes, spacings, ranges of X over
> which non-NA values of Y get plotted) of the curves are very variable,
> and somewhat unpredictable beforehand.
> 
> Of course one could simply wait until the graph was done, and then by
> hand position one's labels to the best effect.
> That, given time, is on a certain sense the optimum solution.
> But I'd like to be able to do a satisfactory job automatically, and
> quickly!
> 
> This is the sort of problem already solved, in one particular way, in
> contour(). But here the curves are broken at the labels and the labels
> are centred on the curves (though nicely aligned with the curves).
> 
> It might be satisfactory for me to place each label so that its
> baseline is on its curve, thus without overlaying the curve with the
> text. So maybe a "displaced" analogue of the way contour() does it
> (including alignment of the text) may be OK.
> 
> Anothe possibility, for instance, is to draw lines from the ends of the
> curves to antries in a plotted table of Z-values. This could end up
> looking very untidym, though.
> 
> I grant that this is a vague query. I'm still trying to form a clear
> view of how it ought to be approached; and I don't have R code to refer
> to and experiment with (that of contour() is hidden in its "method").
> 
> But people out there must have faced it, and I'd be grateful for their
> own feedback from the coal-face!
> 
> With thanks,
> Ted.
> 
> --------------------------------------------------------------------
> E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 16-Jul-08                                       Time: 21:17:13
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E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 16-Jul-08                                       Time: 22:03:45
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