Create a graph from .mat file

Hello!

Need some help figuring out what i need to search in order to:

I wish to make a simple 2d graph from a .mat file i got from picoscope(a software for eletrical signals).

This file loads into matlab the following info:

What a want to do is:

The A variable is my Y axis and Instead of using those 490450 Y values i wish to only use a portion of them? ex: 10 000

The code i have so far is:

B= (sqrt(A.^2));

c = linspace(0,10,490450);

figure(1)

plot(c,B)

ylim([-1,1]);

I realize this is potentially a really simple issue however an answer would really speed up my reasearch and understanding

Thank you!

Answer 1

[José Capitão]

Think i got it!

Code:

B= (sqrt(A.^2));

j= 400000 --> number of Y´s

D= B(1:j,:);

c = linspace(0,Tinterval*j,j);

figure(1)

plot(c,D)

ylim([-1,1]);