Re: FindRoot[] with mixed complex and real variables?
- To: mathgroup at smc.vnet.net
- Subject: [mg79604] Re: FindRoot[] with mixed complex and real variables?
- From: AES <siegman at stanford.edu>
- Date: Tue, 31 Jul 2007 06:04:24 -0400 (EDT)
- Organization: Stanford University
- References: <f8kf7m$lv$1@smc.vnet.net>
In article <f8kf7m$lv$1 at smc.vnet.net>, chuck009 <dmilioto at comcast.com> wrote: > AES, seems to me you have more unknowns than equations. Don't have a third > one do you? Yes -- besides the two initial complex-valued equations, there are the two real constraints: Re[w]==0 and Re[g]==(a fixed & stated value). So, there's enough info to solve the problem, and I can indeed get answers in other ways. My problem is how to get this info into FindRoot[]. > What I usually do when using FindRoot is to first make some > plots of the real and imaginary components to get a ball-park figure for the > zero, say use the "get graphics coordinate" to get it close, then feed in > that value into FindRoot.