I have developed the code spark3.tar.gz for systems of differential equations, possibly stiff and/or implicit. It is based on super partitioned additive Runge-Kutta (SPARK) methods. You can choose between the Lobatto IIIA-B-C-C*-D coefficients, the Radau IIA coefficients, and the Gauss coefficients. I have released the version 3.0 on July 16th, 2001. See the following articles for more theoretical and technical details: Your constructive comments on this code are welcome, especially any bug reported. Let me add that this code SPARK3, though it was not Y1K compliant, is Y2K and even Y3K compliant!
This material is based upon work supported by the National Science Foundation under Grant No. 9983708. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).
Laurent O. Jay
Department of Mathematics
14 MacLean Hall
The University of Iowa
Iowa City, IA 52242-1419
Tel: (319)-335-0898
Fax: (319)-335-0627

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