[R] filled.contour colors

[randhindi]

Hi,

I am trying to set the color scale in filled.contour based on a specific
value instead of a relative position.
Specifically, I want the values below 0 to be in a gradient of green, and
those above 0 to be red. 0 would be white.

I tried:

posZero = abs(min(z)) / (abs(min(z)) + max(z));
filed.contour(..., col = designer.colors(n=30, col=c("green", "white",
"red"), x=c(0, posZero, 1)))

but it does not center the white on the zero.

Thanks for your help,

Rand
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