MATLAB Answers

Index exceeds matrix dimensions

7 views (last 30 days)
Pooja
Pooja on 27 Feb 2020
Commented: Pooja on 27 Feb 2020
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!!!

  5 Comments

Show 2 older comments
Ankit
Ankit on 27 Feb 2020
you can save it as *.mat file (e.g. x1)
Adam
Adam on 27 Feb 2020
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.

Sign in to comment.

Answers (0)

Sign in to answer this question.


Translated by