imag

c = [ 2 %i, 1+0*%i, 2-3*%i  log(-1) (-1)^(1/3) ]
imag(c)
s = sprand(3,3,0.3) + sprand(3,3,0.3)*%i
imag(s)

// Polynomials with complex coeficients:
A = [1-%i*%z (%z-%i)^2]
imag(A)

// Rationals with complex coeficients:
A = [ %z/(1-%z)  (1-%z)/%z^2];
B = A(1,[2 1]);
C = A + %i*B
B, imag(C)