Undefined function 'mtimes' for input arguments of type 'function_handle'.

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furkan öksüz 2020-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/694565-undefined-function-mtimes-for-input-arguments-of-type-function_handle

回答： Steven Lord 2020-12-16

function [T,I]=fonk(f)

a=-1;

b=1;

y=@(x) f./sqrt(1-x.^2);

I=quad(f,a,b);

k=input('k yi giriniz...');

T=0;

for i=1:k

w=pi./k;

x=cos((2.*i-1).*pi./(2.*k));

h=f;

T=T+w*h;

end

fprintf(' T = %13.10f I= %9.2e\n',T,I)

end

Undefined function 'mtimes' for input arguments

of type 'function_handle'.

Error in fonk (line 12)

T=T+w*h;

what can i do to solve this error?

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Answer 1

Daniel Pollard 2020-12-15

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Your function fonk takes f as an input. f must be a function handle in order to satisfy the quad requirements. Later, you set h=f and try to calculate w*h. h is a function handle, so this product doesn't make any sense, hence the error you got. In order to rectify this, you must make h be a number, not a function handle. Perhaps you could give the function its arguments, if its output is numeric.

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furkan öksüz 2020-12-16

编辑：furkan öksüz 2020-12-16

ı input f and ı run this function. if ı dont use function and ı write this script manually its working. T=T+w*h have a problem in this function. Can ı solve it?

thanks for your answer

Daniel Pollard 2020-12-16

I told you what the problem is and how you can solve it. I can't solve it because I don't know what the function is supposed to do. You need to either change the way it works, or give f an argument.

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Answer 2

Steven Lord 2020-12-16

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You cannot multiply a number and a function handle or two function handles.

You can multiply a number and the result of evaluating a function handle or the results of evaluating two function handles.

f = @(x) x.^2;
g = @(x) x.^3;
thisWorks1 = 2*f(5)
thisWorks1 = 50
thisWorks2 = f(8)*g(4)
thisWorks2 = 4096
h = @(x) f(x)+g(x);
thisWorks3 = h(3)
thisWorks3 = 36
thisWillNotWork1 = 2*f
Operator '*' is not supported for operands of type 'function_handle'.
thisWillNotWork2 = f*g