Plot EEG signals from struct

From a mat file, I extracted the following parameters:

data: [15×3000000 double]

data_length_sec: 600

sampling_frequency: 5000

channels: {1×15 cell}

Because the data amount is huge I want to plot only a part of the data matrix. How do I use the sampling frequency in that case?

I started this way:

file=load(file.mat);

data= file.data;

x=data(1,1);

y=data(1,:);

y= y(0,1000);

plot(x,y);

Answer 1

[Cris LaPierre]

Sampling frequency allows you to determine the time each sample (column) of data was collected.

You have 3,000,000 samples per lead (600 sec * 5000 samples/sec). Once you create your time vector, plotting a subset is just a matter of indexing into your array of data. You can learn more about how to do that in Ch 5 and 11 of MATLAB Onramp.