how to Integrate a vector ?

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Nick van der maat 2015-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/215354-how-to-integrate-a-vector

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'.

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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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Answer 1

Star Strider 2015-5-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/215354-how-to-integrate-a-vector#answer_178072

在 MATLAB Online 中打开

Use the trapz or cumtrapz functions:

FuelRateINT = trapz(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS);

or:

FuelRateINT = cumtrapz(MAIN_EngFuelRate,MAIN_TachographVehicleSpeedTOTALROWS);

depending upon what you want.

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Nick van der maat 2015-5-6

Both of these are giving me straight zero's.

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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