I need help writing this function in MATLAB. Question is below.

Write a function function F - indefint(f, a,b, Fa) that returns a callable F such that F(x) evaluates for x e [a,b] the antiderivative of f defined uniquely by F(a) -Fa. (A call to ode45, followed by an anonymous function wrapper around a call to deval, is a straightforward solution.)