Hi matlab experts,

I didn't think daniweb has a matlab forum so I went over to another math forum to ask for matlab help. but i think it's either I am too stupid for the mathematicians or they are too smart to realize that it is NOT obvious what i should do from just function and math theory names thrown at me... conclusion: daniweb explains the best =)

now, since there is no official matlab forum here, I hope I can just try my luck.

Question:

I have some experimental data points plotted y against t where t = 0 to 30, 0.5 interval. I want to find area under graph from, say, t = 0.832 to 5.672

How can I do it in matlab? Please show exact step by step as far as possible, because I am a matlab noob.

So far I have seen example from trapz and quads, but the also require the function f(t) to be known, which is not possible in my case because mine is experimental data.

I expect it to be something like this (psuedocode)

```
f = plot(t, y)
A = integrate(f, t1, t2)
```