Anonymous Function Error Question

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Brittany Isbister 2021-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/768822-anonymous-function-error-question

评论： Stephen23 2021-3-11

Hi All,

I am trying to write an anonymous function that will take the equation and then it will find the parameters for x(1) and x(2). It's telling me that my it can't do it because the size of the left side is 1-by-1 and the size of the right side is 41-by-1. The drug1Dose is a 41x1 structure. Attached is my code. Thank you for your help in advance!

f= @(X,c) c.^X(2)./(X(1)^X(2)+ c.^X(2));
c=drug1Dose;
fun=@(X)f(X,c);
x1=[2,5];
param1=fminsearch(fun,x1)

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Stephen23 2021-3-11

在 MATLAB Online 中打开

"The drug1Dose is a 41x1 structure. Attached is my code."

So lets try it and see what happens:

drug1Dose = struct('whatever',num2cell(rand(41,1)))
drug1Dose = 41x1 struct array with fields:
    whatever
f= @(X,c) c.^X(2)./(X(1)^X(2)+ c.^X(2));
c=drug1Dose;
fun=@(X)f(X,c);
x1=[2,5];
param1=fminsearch(fun,x1)
Operator '.^' is not supported for operands of type 'struct'.

Error in solution (line 2)
f= @(X,c) c.^X(2)./(X(1)^X(2)+ c.^X(2));

Error in solution (line 4)
fun=@(X)f(X,c);

Error in fminsearch (line 200)
fv(:,1) = funfcn(x,varargin{:});