wireframe() display a graph with two colors, not a gradient.
On Sun, Feb 27, 2011 at 1:29 AM, James Platt <james-platt at hotmail.co.uk> wrote:
Hi all,
I'm quite new to wireframe, essentially what I want to do is display a graph, and z-values > 1 would be yellow and those < 1 would be blue.
This is a bit of my data.
0.334643563 ? ? 0.350913807 ? ? 0.383652307
0.370325283 ? ? 0.38779016 ? ? ?0.42387392
0.39861579 ? ? ?0.418389687 ? ? 0.460692165
0.43888516 ? ? ?0.468015843 ? ? 0.520560489
0.499544084 ? ? 0.535099422 ? ? 0.60982153
0.569888047 ? ? 0.634351734 ? ? 0.717646392
0.717202578 ? ? 0.810887467 ? ? 0.935152498
0.901982916 ? ? 1.044895388 ? ? 1.228306176
1.12856184 ? ? ?1.314210456 ? ? 1.462055626
1.377314404 ? ? 1.540372345 ? ? 1.6206216
1.494044604 ? ? 1.618244219 ? ? 1.631295797
data.m = as.matrix(read.table("/Users/James/Desktop/c.txt", sep='\t'))
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)
i know I probably need to use the col.regions or level.colors argument, but I'm not sure what I actually need to supply to the arguments to get it to work.
All the examples I've seen also have a gradient of color between two or more colors, I want to color half the graph with z values > 1 yellow, and <1 blue.
Something like wireframe(volcano, drape = TRUE, at = c(90, 150, 200)) perhaps? Note that color may not vary within a quadrilateral, so your boundary will be jagged to some extent. -Deepayan