How can I plot an ECG txt file for analysis on Matlab?

I have an ECG file in txt format (.txt) and I was hoping to plot it using Matlab.

I have attached the file.

Thankyou for any help and advice.

Answer 1

[Star Strider]

First, read it and assign the variables:

D = readmatrix('ECG_10.11.20_11.57.59.txt', 'HeaderLines',6);
EKG = -D(:,1);                                                                      % EKG Trace (mV)
t = D(:,2)*1E-3;                                                                    % Time Vector (s)

There are a lot of noise and other problems with that signal, so it is going to require a significant amount of processing. It is not regularly-sampled, so the Signal Processing Toolbox resample function will be necessary to assign it to a consistent sampling interval before further processing. (I would resample it to a sampling frequency of 130 Hz.) Note that the leads were apparently reversed, the resons for negating the EKG signal.

I leave all that to you.

[Katrina Anderson]

awesome thankyou!!

Very helpful indeed :)

[Star Strider]

As always, my pleasure!

I very much appreciate your compliment!

Answer 2

[Mathieu NOE]

hello

if you work with a recent release of matlab, there are plenty of solutions... but not all are fast. usually the "modern" function can do very nice on complex formatted files, but the price is it's slow

you can try :

https://fr.mathworks.com/help/matlab/ref/textread.html

and

https://matlabgeeks.com/tips-tutorials/in-out/read-text-file-in-matlab/

but if you just need something simple , fast for simple files , I really enjoy the readclm function - see attached files

it will gives you the header txt and the data , and it's fast !

>> head

head =

HEADER START

USER:

DATE/TIME: 10.11.20 11.57.59

DEVICE_ID: 7B5F7922 DEVICE_VERSION: 3.0.56 APP_VERSION: 1.2.0

CHANNELS:ECG MS

HEADER END

all the best

[Katrina Anderson]

thankyou! i will look into this also as I have just downloaded the new version :) appreciate your help