Is it possible to plot two curves, with two corresponding axes in gnuplot, each of which has a different scale?
For example, y=x**2 and y=x**4 in the same graph (they vary enough to be "uncomfortable" when plotted with the same scale).
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Keith Pinson
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Rook
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@Kazark - Would you mind explaining what was the point of that edit? To make the question non-compatible with both answers, or? – Rook Sep 20 '12 at 01:24
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@Idigas There was of course no intention of obscuring the question. If you think I have done so, you can of course roll back the edit. – Keith Pinson Sep 20 '12 at 15:57
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@Kazark - So why the edit then? – Rook Sep 20 '12 at 18:26
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14Why not to accept one of answers? – brownian Dec 06 '12 at 11:01
2 Answers
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You can have the axes handled automatically without you having to scale them yourself and keep auto-scaling:
set terminal jpeg
set output 'graph.jpg'
set xrange [-10:10]
set ytics 10 nomirror tc lt 1
set ylabel '2*x' tc lt 1
set y2tics 20 nomirror tc lt 2
set y2label '4*x' tc lt 2
plot 2*x linetype 1, 4*x linetype 2 axes x1y2
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4As my axes naturally have a different scale, I found `autofreq` useful. e.g. `set ytics autofreq tc lt 1` – Jared Beck Oct 23 '14 at 03:33
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It is possible to set different ranges for y and y2 (the right axes), and even to set the color of the labels/tics independently.
Then we simply divide the second function by 2 (or something appropriate) and set the colors... as in this example:
set xrange [-10:10]
set yrange [-20:20]
set y2range [-40:40]
set ytics 10 nomirror tc lt 1
set ylabel '2*x' tc lt 1
set y2tics 20 nomirror tc lt 2
set y2label '4*x' tc lt 2
plot 2*x linetype 1, 4*x/2+.5 linetype 2
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