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 performs linear stability analysis and it searches for turning points, simple bifurcation points, and Hopf bifurcation points. It also searches for new branches whenever a branch point is reached. 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 2.4
Performance and memory management have improved. Most problems are now almost twice as fast as they were before, some even faster. Another significant change is in the new framework for user specified functions. This will be valuable to those who find themselves making use of the same expressions again and again. You can define for example pi = cos(-1) as a new user formula, and from that moment on use pi in any problem of your choice.