Having trouble trying to integrate.

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Caleb Banga
Caleb Banga 2022-4-18
评论： Torsten 2022-4-18
Below is my code but I have no idea why it will not run.
I just want to integrate the function (x*.515siin(x)) from 0 to 2.794
fx = @(x) x*(103./200)*sin(x));
q= integral(fx,0,2.794)

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回答（1 个）

Torsten
Torsten 2022-4-18
fx = @(x) x.*103./200.*sin(x);
q= integral(fx,0,2.794)
  2 个评论
Caleb Banga
Caleb Banga 2022-4-18
%Finding the variance of x
mu= @(x) (x-q)^2*(fx);
M= integral(mu,0,2.794)
%Std of x
x_sq=sqrt(M)
I am having similar issue here too, I do not understand what I am doing wrong.
Torsten
Torsten 2022-4-18
"integral" passes vectors for x to your function, not only scalar values. Therefore, you must use elementwise multiplication and division in your function definition:
fx = @(x) x.*103./200.*sin(x);
q= integral(fx,0,2.794)
mu= @(x) (x-q).^2.*fx(x);
M= integral(mu,0,2.794)
%Std of x
x_sq=sqrt(M)

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