**From:** *kjetil@acelerate.com*

**Date:** Fri 14 May 2004 - 22:32:01 EST

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Message-id: <40A48401.23981.3F85D83@localhost>

On 14 May 2004 at 11:45, Karla Meurk wrote:

*> Hi, I would like to plot a graph which sits in the background as a
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*> watermark with other plots in the foreground - on top. I have looked
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*> through the threads on the r-project website but they seem to concern
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*> background colours rather than actual background plots. I have also
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*> searched through the demo's and pars but can't find any eg's
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*>
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*> any ideas - I only want to plot a simple graph using pie.chart()
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*>
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You can do this with the pixmap package.

library(pixmap) and so

?pixmap

An example based on ?pixmap:

*> ## Another example that math can be beautiful
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*> x <- seq(-3,3,length=100)
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*> z1 <- outer(x,x,function(x,y) abs(sin(x)*sin(y)))
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*> z2 <- outer(x,x,function(x,y) abs(sin(2*x)*sin(y)))
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*> z3 <- outer(x,x,function(x,y) abs(sin(x)*sin(2*y)))
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*>
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*> ## Notice that we specify a bounding box to get the correct
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*> ## coordinates on the axes. z1, z2 and z3 are used as red,
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*> ## green and blue channel, respectively.
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*> z <- pixmapRGB(c(z1,z2,z3), 100, 100, bbox=c(-1,-1,1,1))
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*> plot(z, axes=TRUE)
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*> par(new=TRUE)
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*> plot( (-20:20)/20, (-20:20)/20, xaxt="n", yaxt="n", ann=FALSE)
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*>
*

Kjetil Halvorsen

*> Thanks
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*>
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*> Carla
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*>
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*> ______________________________________________
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*> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
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*> PLEASE do read the posting guide!
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*> http://www.R-project.org/posting-guide.html
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*>
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