I cannot see the plotted ecg signal.

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

Answer 1

[Walter Roberson]

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

[Pooja]

Yet it doesn't work. I'm new to Matlab and figuring it out.

Answer 2

[Narendra Dwivedi]

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

[Narendra Dwivedi]

Error in example (line 3)

plot(tm,ecgsig);

ye error aa rhi hai kaise find kare

[Walter Roberson]

What shows up if you use

whos -file 212m.mat

Answer 3

[Diwakar Diwakar]

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

[Walter Roberson]

This does not appear to be a solution to the Question that was asked?