*To*: mathgroup@smc.vnet.net*Subject*: [mg12100] RE: Catching Text of Error Messages*From*: "Ulrich <uroesch@student.uni-kl.de> Roesch" <uroesch@student.uni-kl.de>*Date*: Sat, 25 Apr 1998 01:30:31 -0400*Organization*: Universitaet Kaiserslautern

Hello Everybody out there ! I'm not quite familiar with Mathematica. I have to solve a Problem by using Version 2.2 (Text Mode). We want to characterisize "Blue Phase III", which is in context to Liquid Crystals. Therefore it's nessesary to describe the Problem first with 3D Vektorfields and later in terms of 3D Fieldlines. But this is the Problem : If a Fieldline leaves the Interplated Area, the internal Function NDSolve of Fieldline3D gives the following error message : NDSolve::ndnum: Differential equation does not evaluate to a number at t = 1.61292. We understand, why the Problem occurs, but we want to know exactly the number of t (here 1.61292) in a variable. Then we could limit the calcualtion of the Fieldline to t = ... Now my Question : Is it possilble to catch the Error-message within the value of t into a string or better into an other variable like e.g. t_limit ? I've tried various commands like Check, CheckAbort and assigning other error Messages with NDSolve::ndnum = ... , but we found no way to get the exact value of t. ************ I would be very happy if somebody could give a solution for the Problem (or even a hint) to me ************ Many thanks to everyone, who think about the problem, please answer :-) Ulrich Roesch Universtiy Of Kaiserslautern, Germany - Department of Chemistry - My E-Mail addresses : uroesch@rhrk..uni-kl.de or uroesch@student.uni-kl.de