heatmap with levelplot?
On 12/22/06, Yuli Zhou <yul.zhou at gmail.com> wrote:
Hi, How do I anchor z=0 to the white color in a levelplot so that the color changes from cyan to magenta precisely as z changes from negative to positive?
The changepoints are defined by 'at', and the colors are chosen more or less linearly, so you need to make sure 0 is near the center of your 'at'. E.g. levelplot(cor(mtcars), at = seq(-1.01, 1.01, length = 20))
Also is it easy to change color scheme, say to blue/red as it's more dramatic?
Sure, e.g.
bluered = colorRampPalette(c("red", "white", "blue"), space = "Lab")
levelplot(volcano, col.regions = bluered(100), cuts = 99)
Is there a better function for showing heatmap with a color bar? Thanks in advance for any help, I've played with image, heatmap and levelplot a little and haven't gotten very far. Yuli Zhou
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