Sander Oom wrote:
Dear R users,
Could somebody tell me why the grey color ramp is repeated in this graph, eventhough the ramp values go from 0 to 1? I must be missing something obvious, but I can not see it!
You missed to read the ehlp page ?persp:
"col: the color(s) of the surface facets. Transparent colours are ignored. This is recycled to the (nx-1)(ny-1) facets."
Attention: (nx-1)x(ny-1) facets, but not nx x ny ....
Uwe Ligges
z <- c(0.064329041,0.117243316,0.161565116,0.19923015,0.231642175,0.259835539,0.284571226,
0.038507288,0.094184749,0.140959431,0.180803984,0.215159105,0.245096084,0.271412845,
0.00775022,0.066198255,0.115433207,0.157494219,0.193836765,0.225569076,0.253518629,
-0.02820814,0.032958752,0.084661362,0.128946221,0.167320522,0.200892494,0.230504392,
-0.07003273,-0.005814512,0.048304039,0.094805358,0.135196637,0.170630435,0.201956395,
-0.117878701,-0.050461393,0.005991829,0.054672666,0.097103088,0.134398711,0.167423957)
x <- c(0,1,2,3,4,5) y <- c(50, 100, 150, 200, 250, 300, 350) z <- matrix(z, nrow=length(x), ncol=length(y), byrow=TRUE)
#persp(x, y, z, theta = 30, phi = 30, expand = 0.5, # box= TRUE, axes= TRUE, ticktype = "detailed", main="Title of plot")
hgt <- (z - min(z))/ (max(z) - min(z)) z hgt cols <- grey(hgt) persp(x, y, z, col = cols, theta = 30, phi = 30, expand = 0.5, box= TRUE, axes= TRUE, ticktype = "detailed", main="Title of plot")
Thanks,
Sander.
> version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 0.1 year 2004 month 11 day 15 language R >
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