Function: imag
Section: conversions
C-Name: gimag
Prototype: G
Help: imag(x): imaginary part of x.
Doc: imaginary part of $x$. When $x$ is a quadratic number, this is the
 coefficient of $\omega$ in the ``canonical'' integral basis $(1,\omega)$.
 \bprog
 ? imag(3 + I)
 %1 = 1
 ? x = 3 + quadgen(-23);
 ? imag(x) \\ as a quadratic number
 %3 = 1
 ? imag(x * 1.) \\ as a complex number
 %4 = 2.3979157616563597707987190320813469600
 @eprog
