Re: Q: how to start Solve[] with an initial solution guess?
- To: mathgroup@smc.vnet.net
- Subject: [mg12462] Re: Q: how to start Solve[] with an initial solution guess?
- From: Paul Abbott <paul@physics.uwa.edu.au>
- Date: Tue, 19 May 1998 13:31:30 -0400
- Organization: University of Western Australia
- References: <6jf6bv$4ai@smc.vnet.net>
Bill Christens-Barry wrote: > I have a system of equations that Mathematica 3.0 bogs down on for most > problems of interest. I would like to seed a solution that is found > for one set of parameters into the routine for finding the solution of > a "nearby" problem (meaning one with only slightly different parameter > values). > > How can I do this? Sounds like a perturbation problem -- and Series methods might be useful. > I have tried including a set of conditions (bounds) > on the solution space as inequalities in the system of equations to be > solved, but Mathematica gagged on the form of the inequalities. > > Are there other methods of launching Solve[] from an initial trial > solution? Well, you can certainly pass an initial guess to FindRoot -- which, in many cases is more appropriate than trying to use Solve anyway. > Should I be trying to learn how to instruct Solve[] on what methods it > should be using? If so, where can I learn about this? > > Examples that illustrate any explanation would be especially helpful. An example of the problem you are trying to solve would be especially helpful. Cheers, Paul ____________________________________________________________________ Paul Abbott Phone: +61-8-9380-2734 Department of Physics Fax: +61-8-9380-1014 The University of Western Australia Nedlands WA 6907 mailto:paul@physics.uwa.edu.au AUSTRALIA http://www.pd.uwa.edu.au/~paul God IS a weakly left-handed dice player ____________________________________________________________________