[R] I: a coloured band within each panel of a lattice bwplot

2004-11-05 Thread 8rino-Luca Pantani 
Hi all,
I would like to add to each panel of a bwplot a coloured central band,
centered on the mean of the values, being its width +- 2% of the mean
itself.

I know how to add lines, i.e. something like

bwplot(X ~ Y|FACTOR
   data=my.df,
   panel= function(x, y){
 panel.bwplot(x, y)
 panel.abline(v = mean(x, na.rm = T) - mean(x, na.rm = T) * 0.02
 panel.abline(v = mean(x, na.rm = T) + mean(x, na.rm = T) * 0.02
   })

but I cannot figure out how to shade the region included between the two
lines.

Is it possible, or I'm pretending too much?

Thanks to all.

Ottorino-Luca Pantani, Università di Firenze
Dip. Scienza del Suolo e Nutrizione della Pianta

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Re: [R] I: a coloured band within each panel of a lattice bwplot

2004-11-05 Thread Deepayan Sarkar 
On Friday 05 November 2004 05:05, 8rino-Luca Pantani wrote:
 Hi all,
 I would like to add to each panel of a bwplot a coloured central
 band, centered on the mean of the values, being its width +- 2% of
 the mean itself.

 I know how to add lines, i.e. something like

 bwplot(X ~ Y|FACTOR
data=my.df,
panel= function(x, y){
  panel.bwplot(x, y)
  panel.abline(v = mean(x, na.rm = T) - mean(x, na.rm = T) *
 0.02 panel.abline(v = mean(x, na.rm = T) + mean(x, na.rm = T) * 0.02
 })

 but I cannot figure out how to shade the region included between the
 two lines.

Generally speaking, you want to draw a polygon . There is no lattice 
wrapper for the 'grid.polygon' function, so you will have to use it 
directly. Check out 

 library(grid)
 help(grid.polygon)

For this simpler case though, 'grid.rect' should be sufficient, e.g.

   panel= function(x, y){
   m - mean(x, na.rm = T)
   grid.rect(x = unit(m, native),
 w = unit(m * 0.04, native),
 gp = gpar(fill = lightgrey, col = transparent))
   panel.bwplot(x, y)
   }

Make sure to do a 'library(grid)' before this.

Deepayan

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