Imaginary part of a function while real part is positive

Hi All,

Could anybody suggest/help a way to plot a function's imaginary part while its real part is positive in the contour plot picture?

For example; say one wants to plot the following in the complex plane for z=x+iy,

Im(log(z.^0.5)) when Re(log(z.^0.5))>0

or it could be any other random complex function...

Thanks a lot

Answer 1

[Thorsten]

 F = log(Z.^0.5);
 contour(imag(F).*(real(F)>0))