Set the same y axis scale on two plots

Question

Luca Merolla 2020-7-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/563375-set-the-same-y-axis-scale-on-two-plots

编辑： KLR 2020-7-11

采纳的回答： KLR

fft.png

在 MATLAB Online 中打开

Hello everyone!

I have two FFT plots and the y-axes are scaled differently: on one, the numbers are multiplied x10^-5, and on the other x10^-6. How can I plot both axes on the same scale, for example x10^-6, for a better comparison? Attached there's an image that shows the different scales on the y-axis, and here is the code that generates the figure:

figure;
subplot(1,2,1)
plot(f_b, P1_b)
title('FFT for baseline')
xlabel('Frequency')
ylabel('|P1(f)|')
subplot(1,2,2)
plot(f_e, P1_e)
title('FFT for experimental condition')
xlabel('Frequency')
ylabel('|P1(f)|')

Also because after that, I'm planning to get the area under the curve, so it would be easier to have the signals on the same scale.

I hope I was clear enough. Thank you very much in advance for your help!

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Answer 1

KLR 2020-7-11

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/563375-set-the-same-y-axis-scale-on-two-plots#answer_464420

编辑：KLR 2020-7-11

在 MATLAB Online 中打开

Since you are using subplots to plot the data you can use link axis to link the desired axis. Here's the link that explains in more detail. https://www.mathworks.com/help/matlab/ref/linkaxes.html

Or you can manually set the Ylimits for instance in your plot

figure;
subplot(1,2,1)
plot(f_b, P1_b)
title('FFT for baseline')
xlabel('Frequency')
ylabel('|P1(f)|')
subplot(1,2,2)
plot(f_e, P1_e)
% Add a line here to set the y limits 
ylim([minimumvalue maximumvalue]) % specify the minimum and maximum value so that both the y axis have the same scale
title('FFT for experimental condition')
xlabel('Frequency')
ylabel('|P1(f)|')