Create a graph from .mat file
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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!
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