create a function that is the derivate of a f=@(t) function

having a function

fa=@(x) x^5-0.4475*x.^4-3.1*x.^3 + 3.085*x.^2-0:962*x+ 0:0943

how to calculate

dfa=@(x) diff(fa)

so that it is still a function and i can calculate,for example:

dfa(5)

Answer 1

[Giorgos Papakonstantinou]

Maybe this:

fa = @(x)x^5-0.4475*x.^4-3.1*x.^3+3.085*x.^2-0.962*x+0.0943
g = sym(fa);
dg = diff(g);
df = matlabFunction(dg)

df = 
    @(x)x.*6.17-x.^2.*9.3-x.^3.*1.79+x.^4.*5.0-9.62e-1