How can I integrate a function?

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?

Answer 1

[Jan]

See cumtrapz :

x = 0:0.01:4*pi;
y = cos(x);
s = cumtrapz(x, y);

plot(x, y, 'r', x, s, 'b')