Index exceeds matrix dimensions

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Pooja 2020-2-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/507859-index-exceeds-matrix-dimensions

评论： Pooja 2020-2-27

clear all
close all
 
x1 = fopen('100.dat'); % load the ECG signal from the file
fs = 200;              % Sampling rate
N = length (x1);       % Signal length
t = [0:N-1]/fs;        % time index
 
 
figure(1)
subplot(2,1,1)
plot(t,x1)
xlabel('second');ylabel('Volts');title('Input ECG Signal')
subplot(2,1,2)
plot(t(200:600),x1(200:600))
xlabel('second');ylabel('Volts');title('Input ECG Signal 1-3 second')
xlim([1 3])

The plot window opens but there is no waveform plotted and the following error shows,

Index exceeds matrix dimensions.
Error in Untitled6 (line 15)
plot(t(200:600),x1(200:600))

Kindly help!!!

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Adam 2020-2-27

Isn't the error self-explanatory? Either t or x1 (in this case both, since t is sized based on x1) do not have indices up to 600 - i.e. their size is < 600. If you step through the code with the debugger you will instantly see what the problem is here. Either you need x1 to be longer or you need your indices to be less so that they access data that actually exists in x1.

Pooja 2020-2-27