fplot with two y-axis

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Angel Cuadras
Angel Cuadras 2024-9-20
编辑： dpb 2024-9-20
I would like to fplot two curves Sp and St. Sp in the left Y-axis and the ST in the right Y-Axis. I can get the figure with two axis, I can plot the two curves independently but not together in a single graph. Is it possible?
I am using this code
figure (10)
hold on
fplot(Sp,[0.001 1000],"black")
yyaxis left
ylabel("S_{p}")
ylim ([0.000 0.04])
hold on
fplot(St,[0.001 1000],"--")
yyaxis right
ylabel("S_{t} (JK^{-1})")
ylim ([0.000 0.004])
xscale log
box on
xlabel("R_{2}/R_{1}")
hold off
Thank you very much

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采纳的回答

Star Strider
Star Strider 2024-9-20
编辑：Star Strider 2024-9-20
Ran in:
This seems to work —
Sp = @(t) (5+sin(2*pi*log(t)))/750;
St = @(t) (1+cos(1.5*pi*log(t)))/500;
figure (10)
yyaxis left
fplot(Sp,[0.001 1000],"black")
ylabel("S_{p}")
ylim ([0.000 0.04])
yyaxis right
fplot(St,[0.001 1000],"--")
ylabel("S_{t} (JK^{-1})")
ylim ([0.000 0.004])
xscale log
box on
xlabel("R_{2}/R_{1}")
hold off
.

更多回答（2 个）

Shashi Kiran
Shashi Kiran 2024-9-20
Ran in:
Hi @Angel Cuadras,
I understand that you want to plot two curves using yyaxis with fplot.
Based on the code you provided, here are some corrections made to achieve the correct result.
% Example functions
Sp = @(x) 0.02 * sin(log(x)) + 0.02;
St = @(x) 0.002 * cos(log(x)) + 0.002;
figure(10)
hold on
% Plot Sp using the left y-axis
yyaxis left
fplot(Sp, [0.001 1000], 'black')
ylabel("S_{p}")
ylim([0.000 0.04])
% Plot St using the right y-axis
yyaxis right
fplot(St, [0.001 1000], '--')
ylabel("S_{t} (JK^{-1})")
ylim([0.000 0.004])
% Common settings
set(gca, 'XScale', 'log') % Set x-axis to log scale
box on
xlabel("R_{2}/R_{1}")
hold off
Refer to the following documentations for more details about the functions:
  1. yyaxis: https://www.mathworks.com/help/matlab/ref/yyaxis.html?s_tid=doc_ta
  2. set: https://www.mathworks.com/help/matlab/ref/set.html?s_tid=doc_ta
dpb
dpb 2024-9-20
编辑：dpb 2024-9-20
You forgot to define the two variables to plot, but presuming they were defined, then
yyaxis left
fplot(Sp,[0.001 1000],"black")
ylabel("S_{p}")
ylim ([0.000 0.04])
yyaxis right
fplot(St,[0.001 1000],"--")
ylabel("S_{t} (JK^{-1})")
ylim ([0.000 0.004])
xscale log
xlabel("R_{2}/R_{1}")
should work. You tried to set the axes targets after the fact, not before...

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