Am 14-08-2012 19:40, schrieb Peter Ehlers: > On 2012-08-14 00:09, Christof Kluß wrote: >> But now I search a self-starter for y = a + b * c^x > Can't you just reparameterize with c^x = exp(x * log(c)) ? oh, I've missed this... thank you very much! Greetings Christof