mbrown@hubcap.UUCP (Mike Brown) (10/07/87)
I am looking for information (and source if it is available) for programs/routines which can be used to solve stiff ODEs. I need to solve a set of equations which have rates in the range 1.e-7 to 1.e5. I am especially interested in hearing opinions about routines such as DGEAR and EPISODE. Thanks in advance. -- Mike Brown Department of Computer Science UUCP: ...gatech!hubcap!mbrown Clemson University Internet: mbrown@hubcap.clemson.edu Clemson SC 29634-1906 (803)656-2838
evan@ndcheg.UUCP (Evan Bauman) (10/07/87)
In article <545@hubcap.UUCP>, mbrown@hubcap.UUCP (Mike Brown) writes: > I am looking for information (and source if it is available) for > programs/routines which can be used to solve stiff ODEs. I need to > solve a set of equations which have rates in the range 1.e-7 to 1.e5. > > I am especially interested in hearing opinions about routines such as > DGEAR and EPISODE. > I'm a heavy user of DGEAR in my research. It will use either 12th order Adams predictor-corrector methods or Gear's method for stiff equations. So far, it's been very reliable and moderately fast. It's certainly faster than Runge-Kutta and other similar methods. DGEAR is part of the IMSL package so it's not cheap. Check with your organization's computing center with the hopes that they will foot the bill. Evan Bauman University of Notre Dame ..!iuvax!ndmath!ndcheg!evcae
ags@j.cc.purdue.edu (Dave Seaman) (10/08/87)
In article <292@ndcheg.UUCP> evan@ndcheg.UUCP (Evan Bauman) writes: >DGEAR is part of the IMSL package so it's not cheap. Check with your >organization's computing center with the hopes that they will foot >the bill. IMSL has released a new version of their library which is split into three parts: MATH/LIBRARY, STAT/LIBRARY and SFUN/LIBRARY. The subroutine DGEAR has been replaced by a new routine IVPAG, which is part of MATH/LIBRARY. IVPAG can use the Adams-Moulton or Gear method. I have not actually used this routine, so I can't tell you how it compares with DGEAR. -- Dave Seaman ags@j.cc.purdue.edu