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

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nam bui
nam bui 2021-2-12
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
Image Analyst 2021-2-12
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.
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nam bui
nam bui 2021-2-15
please let me know, what should I fix, I have attached the mat file. Thank you
Image Analyst
Image Analyst 2021-2-15
Look, sample.mat does not have a "current" variable stored in it.
sample = load('sample.mat')
sample =
struct with fields:
sample: [1500×2 table]
Reference to non-existent field 'current'.
Error in test6 (line 10)
X = sample.current;
You need to use a .mat file that has both current and sample variables in it.

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