[Gnuplot-info] How to dynamically specify color for drawing circle in Gnuplot4.3

[lilu29 <lul...@gm...>]

Hi, everyone
Gnuplot4.3 has a new type for drawing circle, and in its manual, it says "An
optinal 4th column may be used to specify color information". But it doesn't
give any example of using this function. All its examples for drawing circle
are specifying color statically.

What I want to do is: I want to draw circles using following input data,
each circle is defined by one line, the 4th column is the painting color.
What should I do???? I tried 
plot "file" using 1:2:3:4 with circles lc rgb $4
plot "file" using 1:2:3:4 with circles lc rgb variable
they all don't work.
Can someone give me some hints?

Thank you very much!

My input data's format is:
x y radius color
2 3  4      "yellow"
1 1  5       "red"
.............



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