On Feb 24, 2011, at 1:01 PM, James Platt wrote:
Hi all,
I'm trying to plot a 3D graph using wireframe, and I want to colour
the graph dependent on z axis values. my z axis range is 0 - 2.
Basically what I want is to colour from various points different
colours. so say 1.4-2 would be blue, 0.4-1.4 red 0 - 0.4 green or
whatever colours.
data.m = as.matrix(read.table("data.txt", sep='\t', header=T))[,-1]
library(lattice)
wireframe(data.m,aspect = c(0.3), shade=TRUE, screen = list(z = 0, x
= -45), light.source = c(0,0,10), distance =
0.2,zlab="Freq",xlab="base",ylab="Fragment")
That is what I have so far, this just uses the rainbow colour, but i
want to assign specific colours to specific regions. I have tried to
look through the documentation but its not terribly clear to me.
Following the advice in help(wirefrane) you need to look at the
levelplot section for advice re: a proper specification to colorkey
and follow the appropriate links in the help pages. Whether your data
is a proper input to wireframe cannot be determined from the included
information, although I suppose your reported success suggests it is.
This is an untested (since there was nothing to test) wild-assed guess
after reading the material I pointed to:
wireframe(data.m,aspect = c(0.3), shade=TRUE, screen = list(z = 0, x =
-45),
light.source = c(0,0,10), distance =
0.2,zlab="Freq",xlab="base",ylab="Fragment",
col=level.colors(x, at = do.breaks(range(data.m), 30),
col.regions = colorRampPalette(c("red", "white",
"blue")(30))
)
(Also not a Mac question so is on the wrong list.)
--
David Winsemius, MD
West Hartford, CT
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