Re: FindMinimum

*To*: mathgroup at smc.vnet.net*Subject*: [mg6990] Re: FindMinimum*From*: daiyanh at mindspring.com (Daitaro Hagihara)*Date*: Thu, 1 May 1997 14:48:37 -0400 (EDT)*Organization*: MindSpring Enterprises*Sender*: owner-wri-mathgroup at wolfram.com

In article <5j758o$5nu at smc.vnet.net>, Sean Ross <SEAN at mail.creol.ucf.edu> wrote: > observation: FindMinimum rarely changes more than one parameter at a time. It > usually minimizes first changing only x, then changing only y, then changing only > z etc. Only occasionally will it make a guess by changing two parameters. My usual amateuristic comments... You probably have stiff set of equations. That's the reason why only one coordinate with the largest derivative is changing at a time. This is readily seen in Davidon-Fletcher-Powell method (as in NR). I personally don't know any algorithm out there that does what you describe (but I'm no pro in this either). Daitaro Hagihara