By Numerics Lab
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Solves systems of algebraic and/or differential equations. Natural language can be used to specify a problem, for example 'solve y = cos(y)'. Some higher index problems (index 2 and above) can be solved too, including problems on mechanical systems with holonomic constraints. Continuation along branches of stationary solutions is possible. DAE Solver will perform linear stability analysis and it will search for turning points, simple bifurcation points, and Hopf bifurcation points. Multiple documents are allowed, with unlimited undo. Results are generated as tables and graphs that can be copied to the Clipboard, and animations that can be saved as movie files. AppleScript is supported, with scripts that DAE Solver builds as a problem is defined and that can later be customized. Mac OS X 10.6.8 is still supported.
What's New in Version 2.2
Changes aimed at improving performance and stability and at reducing both memory and CPU usage have resulted in a 20% increase in performance, which should be more noticeable in larger problems. A more reliable algorithm for initiation and a new algorithm for branch switching at simple bifurcation points are now available in continuation problems. In addition, many bugs haven been fixed in the new user interface for problem definition.