[Rd] contour() labels (PR#441)

[Prof Brian D Ripley]

On Wed, 16 Feb 2000 Ray.Brownrigg@mcs.vuw.ac.nz wrote:

> R-0.99.0a now plots contour labels from contour(), but the values in
> levels seem to be coerced to integer.
> 
> Reproduce by:
> > set.seed(2)
> > contour(matrix(runif(36),nrow=6), labcex=1.2)
> 
> and compare with:
> > set.seed(2)
> > contour(matrix(10*runif(36),nrow=6), labcex=1.2)
> 

The code has (plot3d.c, ca line 718)

		/* Need to send labels in from interpreted R code ? */
	        sprintf(buffer, " %.00f ", zc);

so, yes, it is printed as an integer, and the comment there is right.  
I guess the labels should be format(levels) by default, to ensure that
the use of trailing zeros is consistent, but it should be in R code
so users can override the default precision, say.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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