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

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Mathew Lindley 2018-1-22

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评论： Mathew Lindley 2018-1-28

采纳的回答： Torsten

I am trying to integrate a function of propulsive power (positive values only) with respect to time to give energy. The propulsive power is in the form of a 10321x1 double matrix. The time is to range between 0 and 1032.1 seconds. The code I am inputting is as follows:

E = integral(Px_Pos,0,1032.1)

I am greeted with the error: Undefined function 'int' for input arguments of type 'double'. Can someone please help me?

I am new to MatLab and so my apologies if this is a trivial question.

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Torsten 2018-1-22

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Use "trapz" instead of "integral".

Best wishes

Torsten.

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Torsten 2018-1-23

Put your times in a 10321x1 vector T as well as the propulsive power in a 10321x1 vector P.

Then call "trapz" as

I = trapz(T,P).

Best wishes

Torsten.

Mathew Lindley 2018-1-28

Torsten,

Many thanks for your help, this has worked.

Kind regards, Matt

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