Output is giving me "Empty sym: 0-by-1"

syms s
g = (s^2-2*s+2)/((s+2)*(s+4)*(s+5)*(s+6))
x = diff(g)
b = roots(x)

I'm trying to solve for the roots of the differentiated function, but I'm getting the "Empty sym: 0-by-1" output, and I'm unsure why. I've followed the syntax on how everything should be, but I don't know why this is being outputted.

Answer 1

[Walter Roberson]

roots() is not explicitly defined for symbolic expressions, and will not work for scalar symbolic expressions. It is also only defined for polynomials, but g is not a polynomial. Instead use

b = solve(x);

Answer 2

[JESUS DAVID ARIZA ROYETH]

solution:

syms s
g = (s^2-2*s+2)/((s+2)*(s+4)*(s+5)*(s+6))
x = diff(g)
b = double(solve(x))