Convert ECG signal waveform into text file

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NOORAISYAH NABILAH
评论： Walter Roberson 2021-3-11
Hi.
I want to ask is it possible to convert ECG signal waveform into text file? And if it is possible how to perform it?
I am able to load the ecg data file in .mat file from database and processed it through according to the matlab code written.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2021-3-2
Steps:
%load the mat file
data=load('mat_file.mat');
%Save the data in txt file
dlmwrite('filename.txt',data)
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NOORAISYAH NABILAH
NOORAISYAH NABILAH 2021-3-4
Sir @Walter Roberson @KALYAN ACHARJYA, how can we distinguish datapoints of the x and y axis of the waveform. I mean it only have the amplitude value of the waveform. How can we know the x axis value (time (s)) corresponding with the y axis value (amplitude)?
How to convert with both values and time?
Walter Roberson
Walter Roberson 2021-3-11
@NOORAISYAH NABILAH
time = (0:length(val)-1)/Fs;
Here Fs needs to be the sampling frequency, in hertz (cycles per second.)
Nothing in the .mat file has information about the sampling frequency; you cannot deduce it from the data itself. You would need to find it as external information.

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