Updates:
Status: Accepted
Labels: -Type-Defect Type-Enhancement EasyToFix Solvers
Comment #1 on issue 2238 by asmeurer: Autodetection of dependent variable
in dsolve, checkodesol and other high level function in ODE module
http://code.google.com/p/sympy/issues/detail?id=2238
This should be easy to do. Just make func a keyword argument with default
value None (or 'auto'), and when no function is given, introspect. There
should be a new internal function in ode.py that tries to find it (unless
it's a one-liner). If there is more than one possible function that the
expressions is a differential equation in, then it should raise ValueError.
By the way, don't forget when matching that you can have something like
Derivative(x + f(x)).
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