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Student Support Forum > General > > "Matrix implementation in NDSolve"

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Original Message (ID '187824') By asefi:
Hi peter, Now i know that the problem is that NDSolve cant solve DAE including Sign of dependent variables, because it means the configuration of equations will be changed, i found in new version(mathematica 9), mathematica offered WhenEvent function , so i am studying how to apply that to my problem. If you have any suggestion please advise me. Thanks