Eig(A) returns long fractional answer instead of a single number

Eig(A) returns

(22/(9*(- 5/3 + (8623^(1/2)*1i)/27)^(1/3)) + ((8623^(1/2)*1i)/27 - 5/3)^(1/3) - 3)^(1/2)

instead of

-0.7462i

Is there a way to change it so decimal answers appear?

Answer 1

[Bhupendra Prajapati]

You can use double(eig(A)).

Answer 2

[Steven Lord]

If the symbolic expression doesn't contain a symbolic variable and you're okay with approximating it in double precision, call double on it.

If it does contain a symbolic variable or your need a numeric approximation to higher than double precision, use the vpa function.

If you don't need to define A as a symbolic expression, define it as a double array and call eig on that numeric array.

Answer 3

[madhan ravi]

 sympref('FloatingPointOutput',1) % run this once and you don’t have to call vpa() or double() every single time
 doc sympref