Function Error: Already declared

Question

Chase Weinberg 2019-11-11

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https://ww2.mathworks.cn/matlabcentral/answers/490510-function-error-already-declared

评论： Yasmeen 2023-7-19

采纳的回答： Chase Weinberg

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My function was working fine until I typed in clear all. Now it does not work.

I get this error message: Function 'get_portfolio_return' has already been declared within this scope.

This is my function code:

function [E_Rp, sigma_Rp] = get_portfolio_return( weight,exp_rets, vols,corr) 
E_Rp= weight.* exp_rets(1,1)+ (1-weight).*exp_rets(1,2);
sigma_Rp= sqrt((weight.^2.*vols(1).^2) + ((1-weight).^2.*vols(2).^2)+(2.*corr.*(weight)).*(1-weight).*vols(1).*vols(2));
 
end
% The stated function defines the necessary variables for subsequent
% calculations.  Expected Return is calculated as a function of weight and
% expected returns.  Weight is the weight of Asset1 and exp_rets are the
% expected returns of asset 1 and asset 2.

What caused this problem/ how do I fix it?

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Jeremy 2019-11-11

Did you save this as a function file separate from your main script file, or did you put it at the bottom of your script as a local function? Did you do both? How are you calling it?

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Answer 1

Chase Weinberg 2019-11-11

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Okay, so the problem was the function name was different from what I assigned it. I did not realize the name I saved it as has to match the part after function []=

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Walter Roberson 2019-11-11

The rule is that if there is a difference between the file name and the name of the first function in the file, then in order to call the function, you need to use the file name.

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