How to set a variable line width when plotting?

I would like to plot a curve with a variable line width. I normally would do the following if I wanted to use points instead of a line:

gnuplot> plot 'curve.dat' u ($1):($2):($1) ps var


where curve.dat is filled with:

0 0
1 1
2 4
3 9
4 16
5 25


and so on. Now if I try something similar for the line width:

gnuplot> plot 'curve.dat' u ($1):($2):($1) lw var


I get the error message:

undefined variable: var


Or is this something that cannot be done with gnuplot?

1 Answer
1

You're right that linewidth doesn't accept var like pointsize does. But you can have a similar effect by using filledcurves:

linewidth

var

pointsize

filledcurves

WIDTH_FACTOR=20
plot 'curve.dat' u ($1):($2+$1/WIDTH_FACTOR):($2-$1/WIDTH_FACTOR) w filledcurves


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