matrix value in broyden's method

Ok guys, for the iteration part of my broyden's method I have:

    temp = x;
    x = x - jac(x)\f(x);
    s = x - temp;
    y = f(x) - f(temp);
    jac(x) = jac(x) + (y - jac(x)*s)*s'/(s*s);

now when I run this I get an error saying:

Error using * Inner matrix dimensions must agree. Error in broyden (line 32) jac(x) = jac(x) + (y - jac(x)*s)*s'/(s*s);

anyone know why this doesn't work?

[ZhenQi]

never mind I got it to work

Answer 1

[Andrei Bobrov]

jac(x) = jac(x) + (y - jac(x)*s)*s.'/(s(:).'*s(:));

or

jac(x) = jac(x) + (y - jac(x)*s)*s.'/norm(s).^2;