I want to plot points, each with X, Y and a color. How do I do that in Gnuplot?
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2 Answers
You can try something like this:
Line plot in GnuPlot where line color is a third column in my data file?
For example:
plot "./file.dat" u 1:2:3 with points palette
where file.dat contains your data, the first column is the x axis and the second column is the y axis, the third column is the colour.
Comments
You could consider looking at the Pyxplot plotting package http://pyxplot.org.uk, which has very similar syntax to gnuplot (albeit cleaned up considerably), and which allows point styles to be specified on a point-by-point basis. For example, in Pyxplot:
plot "file.dat" using 1:2:3 with points color rgb($4,$5,$6)
would take the RGB components for the color of each point from the 4th, 5th and 6th columns of the data file. Alternatively,
plot "file.dat" using 1:2:3 with points color $4
would read the numbers in the 4th column of the data file (call it n), and plot each point with the n-th color from the palette. If n is non-integer, say 2.5, it gives you a color half way between color 2 and color 3 in RGB space.
1 Comment
tommy.carstensen
The syntax is quite different from gnuplot. In gnuplot you can't do color rgb(r,g,b).