I cannot see the plotted ecg signal.

3 次查看（过去 30 天）
Pooja
Pooja 2020-2-21
评论： Walter Roberson 2023-4-25
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

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回答（3 个）

Walter Roberson
Walter Roberson 2020-2-21
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
Narendra Dwivedi
Narendra Dwivedi 2023-3-26
编辑：Walter Roberson 2023-3-26
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
  2 个评论
Narendra Dwivedi
Narendra Dwivedi 2023-3-26
Error in example (line 3)
plot(tm,ecgsig);
ye error aa rhi hai kaise find kare

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Diwakar Diwakar
Diwakar Diwakar 2023-4-25
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

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