How can I force a MATLAB plot with two y-axes to have 0 at the same height for both axes?

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Joseph Cunningham 2022-10-6

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评论： Joseph Cunningham 2022-10-7

I'm plotting two metrics vs a single x-axis. However, when the plots are output, the 0 for each of the y-axes is at a different vertical position in the graph. How can I cause them to be in the same position? (ie. at the bottom edge of the graph?) For reference, all values plotted are positive. See the attached:

Thanks!

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Walter Roberson 2022-10-6

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To have the plots have a common origin, you need to adjust the ylim() for one or both plots such that the first value for the second plot has the same proportion relative to its ylim as the first value of the first plot has relative to its ylim.

rng(12345)

y1 = randn(50,1);

y2 = randn(50,1) .* sin(2*pi*rand(50,1));

yyaxis right

plot(y1)

ylim auto

yyaxis left

plot(y2)

ylim auto

[l1, u1] = bounds(y1);

[l2, u2] = bounds(y2);

[l1, u1; l2, u2]