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I cannot see the plotted ecg signal.

조회 수: 3 (최근 30일)
Pooja
Pooja 2020년 2월 21일
댓글: Walter Roberson 2023년 4월 25일
clear all
close all
x1 = load('100m.mat'); % load the ECG signal from the file
fs = 360; % 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 message that i get:
Error using plot
Invalid property found.
Object Name: line
Property Name: 'val'.
Error in Untitled6 (line 12)
plot(t,x1)
A plot window opens but there is no plotting of signal

답변 (3개)

Walter Roberson
Walter Roberson 2020년 2월 21일
When you load() a mat and assign to a variable the result is a struct with one field for every variable name loaded. You need to extract the value from the struct. The evidence suggests that at least one of the field names is "val" so x1.val might be appropriate
  댓글 수: 1
Pooja
Pooja 2020년 2월 21일
Yet it doesn't work. I'm new to Matlab and figuring it out.

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Narendra Dwivedi
Narendra Dwivedi 2023년 3월 26일
편집: Walter Roberson 2023년 3월 26일
load 212m.mat
figure
plot(tm,ecgsig);
hold on
plot(tm,(ann),ecgsig(ann),'ro')
xlable('second')
ylable('amplitude')
title('subject -MIT-BIH 212m.mat')
qrxEx= ecgsig(4560:4810);
fb= dwtfilterbank('Wavelet','sym4','signallength');
psi= wavelets(fb);
figure
plot(grsEx)
hold on
plot(-2*circshift(psi(3,:),[0 -38]),'r')
axis tight
legend('QRS Complex','sym4 Wavelet')
title('comparison of sym4 Wavelet and QRS Complex')
hold on
  댓글 수: 2
Narendra Dwivedi
Narendra Dwivedi 2023년 3월 26일
Error in example (line 3)
plot(tm,ecgsig);
ye error aa rhi hai kaise find kare
Walter Roberson
Walter Roberson 2023년 3월 26일
What shows up if you use
whos -file 212m.mat

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Diwakar Diwakar
Diwakar Diwakar 2023년 4월 25일
close all
x1 = load('100m.mat'); % load the ECG signal from the file
x1=(x1.val)./200;
fs = 360; % 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])
Need to normalize the ecg signal. please check the above code.
thanks
  댓글 수: 1
Walter Roberson
Walter Roberson 2023년 4월 25일
This does not appear to be a solution to the Question that was asked?

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