How to cut off part of the figure out after you filtered it

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nam bui 2021-2-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/743932-how-to-cut-off-part-of-the-figure-out-after-you-filtered-it

评论： Image Analyst 2021-2-15

Hello, I'm trying to cut out part of my plot but I dont know how I could modify the script to cut it out and here is what I got so far after I apply a lowpass filter.

Thank you for your time

 Ts = 0.01;
  Fs = 1/Ts;
  Fm = Fs/2;
  Fc = 2;
  N =10;
  d = fdesign.lowpass('N,Fc',N,Fc,Fs);
  designmethods(d);
  Hd = design(d);
   %fvtool(Hd)
   %X is a variable form csv
   %X1 is a variable from csv
   output = filter(Hd,X);
   output1 = filter(Hd,X1);
   figure;
   plot(X,X1,'-g');
   hold on
   plot(output, output1,'r');
   hold off
   legend('raw signal','filtered signal')
   xlabel('SWA (deg)')
   ylabel('SWT (N.m)')
   title('SWA vs SWT')
   grid on
   
figure

subplot(2,1,1)
plot(X,X1);
title('Original plot');
uiwait(msgbox('Select an x-value from which to crop','modal'));
[x_user ~] = ginput(1); % Let the user select an x-value from which to crop.
x(x>x_user) = [];
subplot(2,1,2);
plot(output, output1);
title('New plot with cropped values');
xlim([min(x(:)) max(x(:))]);

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回答（1 个）

Image Analyst 2021-2-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/743932-how-to-cut-off-part-of-the-figure-out-after-you-filtered-it#answer_622237

在 MATLAB Online 中打开

You could just display from 100 on:

xlim([100, max(output1)]);

or you could remove everything less than x=100

startingIndex = find(x >= 100, 1, 'first');
output = output(startingIndex : end);
output1 = output1(startingIndex : end);
X = X(startingIndex : end);
X1 = X1(startingIndex : end);

Of course you could use max(x_user) instead of 100 if you want.