| Differential equations solver in IDL 4.0 [message #5268] |
Tue, 21 November 1995 00:00 |
ob10001
Messages: 2
Registered: October 1994
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Junior Member |
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Dear all,
I have recently come back to some routines for solving ordinary differential
equations that were written in IDL 3.6. A typical statement read like:
diffEQ_45, "WKB",[amplnull,zgeomnull,omeganull,kwavenull,mwavenull],$
tnull,tfinal,times,vars,PARAMS=[fcor,Nbv],TOL=1e-6
The procedure diffEQ_45 is now no longer supported (although still accessible,
I think), nor documented.
But the only procedure `replacing' diffEQ_45 in IDL 4.0 is RK4, which has no
error tolerance keyword, no automatic step-size control, and apparently is
also not capable of passing parameters to the function evaluating the
derivatives!
So my question is whether there is a proper replacement of diffEQ_45 in IDL
4.0 that I have simply overlooked.
Regards, Oliver.
------------------------------------------------------------ -------------------
oliver buhler ob10001@damtp.cam.ac.uk
department of applied mathematics and theoretical physics
university of cambridge, england
--
------------------------------------------------------------ -------------------
oliver buhler ob10001@damtp.cam.ac.uk
department of applied mathematics and theoretical physics
university of cambridge, england day-time phone +44 1223 337866
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