Solve a Differential/Algebraic System

This routine solves a system of differential/algebraic equations of the form g(t,y,y').  Backward differentiation formulas are used to solve for y and y' as t varies from an initial T to TOUT.  This code is based on an original code by Dr. Linda Petzold, with stepsize selection based on work by Gustaf Söderlind, and a few other changes.
This software is part of the MATH77/mathc90 collection here.

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Extras (Uncheck those you don't want):
Support for constraints
Support for user defined linear algebra
Support for numerical differentiation

Data type:   Double   Single
Language:   f77   c
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Single user price for "base package" = $20 + for clean source (optional) $200 + for optional support $60.

Single user price for "Support for constraints" = $10 + for clean source (optional) $10 + for optional support $20.

Single user price for "Support for user defined linear algebra" = $20 + for clean source (optional) $10 + for optional support $30.

Single user price for "Support for numerical differentiation" = $30 + for clean source (optional) $80 + for optional support $50.

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