[R] analytic derivative of complex function

[Timur Elzhov]

Hello, Robin. Thanks for your reply.

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On Fri, Jan 16, 2004 at 03:39:48PM +0000, Robin Hankin wrote:

> the differential of sin(z) is cos(z), over the whole complex plane.
> 
> If you have a function in terms of its real and imaginary components, 
> and you know that the function is differentiable, then use the 
> Cauchy-Riemann equations.

Ok, say I have z - _extremely_ long and hard complex _expression_.
What if I'd like to take analytic derivative from Arg(z)?

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Timur.