[Help-gsl] finding roots, solving ODEs and numerical integration of complex functions

[Владимир Дрынкин]

Hello, all!

I have three questions:
a) how can i find complex roots of nonlinear and nonpolynomial
function? The example of this function is described here:
http://lists.gnu.org/archive/html/help-gsl/2007-04/msg00046.html but
no one has answered this thread :(
b) how can i numerically integrate the function returning complex
numbers (for example, gsl_complex_tan)? i have read the gsl reference,
but it seems like there is no appropriate algorithms.
c) if i have an ODE like dy/dz=f(z) and the function f(z) returns
complex numbers, how can i solve it numerically? what algorithm should
i use?

Thanks a lot,
Vladimir.