How can I integrate a function?

2017 3 22
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For example if I have a vector with values that describe the cos(x) function, and as a result of integration i get the values of the sin(x) function. In my case my function is a flow signal (flow_proccessed) and i want to get the volume (vol). how can I do that?

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Jan
Jan 2017-3-22
编辑：Jan 2017-3-22

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See cumtrapz :
x = 0:0.01:4*pi;
y = cos(x);
s = cumtrapz(x, y);
plot(x, y, 'r', x, s, 'b')

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