finding integration by using quad command

function y =myfun(x) y=1/(x^3-2*x-5); Q=quad(@myfun,0,2)

after running this programme a get this error ??? Input argument "x" is undefined.

Error in ==> myfun at 2 y=1/(x^3-2*x-5);

please help to solve this programme

Answer 1

[Andrei Bobrov]

y=@(x)1./(x.^3-2*x-5);
Q=quad(y,0,2);

or

% function in m-file: myfun.m

function y =myfun(x), y=1./(x.^3-2*x-5); end

% use myfun function

>> Q=quad(@myfun,0,2)