compute numerical integral by matlab

Hello everybody Please,I want to know,how compute integral from 2 to infinity for any function using matlab? thanks in advance

Answer 1

[Matt Fig]

Put the function in an anonymous function, then use QUADGK.

[reem]

Thank you so much Matt

but when I wany to run the function,some error occur

how can I solve it?

function y = myfun(X)

y=(1/sqrt(2*pi))*exp(-0.5*X^2);

Q=quadgk(@myfun,2,inf)

display(Q)

end

??? function y = myfun(X)

|

Error: Function definitions are not permitted at the prompt or in

scripts.

[Matt Fig]

Don't put the keyword: function in a script or at the command line. Just do this:

y=@(X)(1/sqrt(2*pi))*exp(-0.5*X.^2); % Anonymous func.

Q=quadgk(y,2,inf)

[reem]

Thank you so so so much

you are very kind and smart

I hope all best things for you

Kind regards