how to Integrate a vector ?

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Nick van der maat
评论： John D'Errico 2015-5-6
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'.
  1 个评论
John D'Errico
John D'Errico 2015-5-6
Note that integrate is not designed to integrate a data vector. As Star points out, use trapz or cumtrapz, depending on your goal.

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回答（1 个）

Star Strider
Star Strider 2015-5-6
Use the trapz or cumtrapz functions:
FuelRateINT = trapz(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS);
or:
FuelRateINT = cumtrapz(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS);
depending upon what you want.
  2 个评论
Nick van der maat
Nick van der maat 2015-5-6
Both of these are giving me straight zero's.
Star Strider
Star Strider 2015-5-6
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.

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