curve/data fitting with complex data and complex function

Hi, I have a set of complex data that I want to fit with a complex function using lsqcurvefit or lsqnonlin.

For example:

xdata=[1 2 3]
ydata=[3j 4 5-j]

function F = myfun(x,xdata)
F = x(1)+x(2)*xdata + j*(sin(x(3)*xdata));

How can I perform a least-squares-fitting of the function to the data so that I obtain the real parameters x?

Cheers Stefan