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Re: right StoppingTest

• To: mathgroup at smc.vnet.net
• Subject: [mg31766] Re: right StoppingTest
• From: atelesforos at hotmail.com (Orestis Vantzos)
• Date: Sat, 1 Dec 2001 02:45:03 -0500 (EST)
• References: <9tvgln$fql$1@smc.vnet.net> <9u20bm$ipa$1@smc.vnet.net> <9u4h3q$lpl$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

It's a better-safe-than-dead thing, in this case.
Generaly, you don't want the test to be evaluated BEFORE the solution
gets going (as would be the case with an 'ordinary' ->), but only
within the NDSolve code, so we use :> (RuleDelayed).
For instance:
NDSolve[.....,StoppingTest->(Print[t];False)] would return something
like this:
t
Out[13]:= -InterpolatingFunction-
which is not what you want!
If you use the same command with a :> instead of ->, you will get all
the t's, that are used as intermediate steps, printed and the
interpolating function returned as desired.
Orestis