Multiple Anonym Function return wrong values

Question

Pavel M 2022-1-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1632500-multiple-anonym-function-return-wrong-values

回答： Alan Stevens 2022-1-20

Hello, I have a function that return 3 same values, but they must be different

C = [4622 5480 18923]*1e-12;
U = [454e3 454e3-20e3 20e3].*sqrt(2);
function W = Energy(C,U)
    f = 50;
    T = 1/f;
    t = [0:0.00001:T/4];
    
    fun = @(t) (U.^2/(2*1./(2*3.14*f*C)) * sin(2*2*3.14*f*t));
    fun2 =  @(C, U) (integral(fun, t(1), t(end)));
    for i = 1 : 3
        W(i) = fun2(C(i), U(i)) ;
    end
end

returned values are

w =
952.7728  952.7728  952.7728

What could be wrong in my code?

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Answer 1

Alan Stevens 2022-1-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1632500-multiple-anonym-function-return-wrong-values#answer_878095

在 MATLAB Online 中打开

Here's one solution:

C = [4622 5480 18923]*1e-12;
U = [454e3 454e3-20e3 20e3].*sqrt(2);
W = Energy(C,U);
disp(W)
   1.0e+03 *

    0.9527    1.0322    0.0076
function W = Energy(C,U)
    f = 50;
    T = 1/f;
   
    for i = 1 : 3
        fun = @(t) (U(i).^2/(2*1./(2*3.14*f*C(i))) * sin(2*2*3.14*f*t));
        fun2 =  @(C, U) (integral(fun, 0, T/4));
        W(i) = fun2(C(i), U(i)) ;
    end
end