integration of signal in matlab

Matlab has an amazing help support. You can find almost all the functionalities with an example in Matlab help section.

Why don't you try them ?

For This particular question of yours, you can Do it using two different methods.

* CUMSUM
* TRAPZ ( Trapezoidal Integral )

Using CUMSUM :
Depending on what Domain your signal is sampled you can do one of the following methods. ( Assuming the Signal yo be Y )
-- In Frequency Domain :
integralOfY = CUMSUM (Y) / f ( where f : sampled frequency )

-- In Time Domain :
integralOfY = CUMSUM (Y) . * [ 1; diff(t)] ( where t : sampled time interval )

Using TRAPZ :

-- Z = TRAPZ ( Y ) : Integral of Y
-- Z = TRAPZ ( X, Y) : Integral of Y wrt X


BR//
Harsha