Dear R experts, I'd like to take analytic derivative of complex functions through "D" function. I succeded with simple functions like "sin(x)", but what if I want to work with function like A(x,y, ...) + i*B(x,y, ...)? Thank you. -- WBR, Timur.
Hello, Robin. Thanks for your reply. -- 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)? -- Timur.