palette plus extra color?

[Allin C. <cot...@wf...>]

The following doesn't work (not surprising) but I'm wondering if 
there's any real gnuplot syntax that'll do what it's trying to do:

plot for [i=0:*] 'polygons.dat' index i with filledcurves \
  fc ($3 < 0 ? 'gray' : palette)

The datafile contains several datasets representing polygons; the 
first 2 columns hold the coordinates of vertices and the third a 
value to be colorized (if >= 0) or shown as missing (gray) if 
negative.

-- 
Allin Cottrell
Department of Economics
Wake Forest University