Using functions "real" and "imag" in vector

[John B. Thoo]

Hi, everyone.

My question is about using the functions "real" and "imag" in  
defining a vector.  Specifically, why do I get the following error;  
what does it mean; and what is the correct way?

octave-3.0.5:22> real (1)
ans =  1
octave-3.0.5:23> imag (1)
ans = 0
octave-3.0.5:24> x0 = [real (1), imag (1)]
error: real: too few arguments
error: evaluating assignment expression near line 24, column 4
octave-3.0.5:24>

Thanks.

---John.