how to Integrate a vector ?

Hello,

I am trying to integrate a vector,

FuelRateINT = integrate(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS,1);

% MAIN_TachographVehicleSpeedTOTALROWS = number of last row
% 1 = start row

It keeps giving the error :

Undefined function 'integrate' for input arguments of type 'double'.

[John D'Errico]

Note that integrate is not designed to integrate a data vector. As Star points out, use trapz or cumtrapz, depending on your goal.

Answer 1

[Star Strider]

Use the trapz or cumtrapz functions:

FuelRateINT = trapz(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS);

or:

FuelRateINT = cumtrapz(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS);

depending upon what you want.

[Nick van der maat]

Both of these are giving me straight zero's.

[Star Strider]

That has to do with your data. Post your data (or a representative sample, preferably as a .mat file). It is impossible to figure out the problem without them.