NDSolve Errors: icfail and ntdv
- To: mathgroup at smc.vnet.net
- Subject: [mg77226] NDSolve Errors: icfail and ntdv
- From: ehicks <ehicks at uchicago.edu>
- Date: Wed, 6 Jun 2007 06:43:37 -0400 (EDT)
I am trying to solve a set of equations with NDSolve. The problem
is no matter what I do, I keep getting errors of various kinds. I've
used NDSolve successfully in the past, so I am starting to wonder if
maybe this set of equations just doesn't have a solution. My set is
diffeo-alegbraic, so at first I got the NDSolve::icfail error. I
tried to circumvent that by taking the derivative of one of the
equations. Then I got the NDSolve::ntdv error. So I tried
SolveDelayed->True, which just got me right back to the icfail error.
Does anyone have any ideas on ways to circumvent these errors?
See the Mathematica File at: http://www.tarzia.selfip.com/~elizabeth/fullplumemodel1.nb
The text of the errors is:
NDSolve::icfail: Unable to find initial conditions which satisfy the
residual function within specified tolerances. Try giving initial
conditions for both values and derivatives of the functions.
NDSolve::ntdv: Cannot solve to find an explicit formula for the
derivatives. Consider using the option setting SolveDelayed->True.
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