Hi,
I'm solving a non-linear system of equations with FindRoot. The system is very sparse, if I can say that about a non-linear system. After a few seconds of computation, Mathematica outputs the answer and gives me the error
FindRoot::lstol: The line search decreased the step size to within tolerance specified by AccuracyGoal
and PrecisionGoal but was unable to find a sufficient decrease in the merit function.
You may need more than MachinePrecision digits of working precision to meet these tolerances. >>
I have played around with DampingFactor, WorkingPrecision and AccuracyGoal to no avail: When I verify the solutions that Mathematica gives me, at best about 1/3 of them are not satisfied. Can you help me figure out what should I be looking at?