Integral not calculating. Too many input requirements and error using function.

Question

Kaylee Chavez 2021-3-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/770273-integral-not-calculating-too-many-input-requirements-and-error-using-function

回答： Basil C. 2021-3-12

Hi there. I am just trying to take the integral of a simple function in MATLAB and it is not calculating. I was messing with it for awhile and I went from too many input arguments to not enough input arguments. I am sure it is a simple solution, but I cannot seem to figure it out.

>> syms Z
>> E = @(Z) Z.^2.+9.
E =
  function_handle with value:
    @(Z)Z.^2. +9. 
>> I = integral2(E, 0, 2, 0, 2*pi)
Error using @(Z)Z.^2. +9. 
Too many input arguments.
Error in integral2Calc>integral2t/tensor (line
228)
        Z = FUN(X,Y);  NFE = NFE + 1;
Error in integral2Calc>integral2t (line 55)
[Qsub,esub] = tensor(thetaL,thetaR,phiB,phiT);
Error in integral2Calc (line 9)
    [q,errbnd] =
    integral2t(fun,xmin,xmax,ymin,ymax,optionstruct);
Error in integral2 (line 106)
    Q =
    integral2Calc(fun,xmin,xmax,yminfun,ymaxfun,opstruct); 

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Answer 1

Basil C. 2021-3-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/770273-integral-not-calculating-too-many-input-requirements-and-error-using-function#answer_645613

在 MATLAB Online 中打开

The error occurs from the fact you are performing a double integration but are passing only one variable so MATLAB doesnt know which limit applied to which variable. Rather try using this:

E = @(x,y) x.^2+9

or

E = @(x,y) y.^2+9

depending on your application and then perform the double integration

I = integral2(E, 0, 2, 0, 2*pi)