Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 2180 by [email protected]: examples/advanced/relativity.py stopped working
http://code.google.com/p/sympy/issues/detail?id=2180

$ python examples/advanced/relativity.py
[...]
Solve Einstein's equations:
Traceback (most recent call last):
  File "examples/advanced/relativity.py", line 221, in <module>
    main()
  File "examples/advanced/relativity.py", line 214, in main
    l =  dsolve(e, lam(r))
  File "/home/ondrej/repos/sympy/sympy/solvers/ode.py", line 401, in dsolve
    hints = classify_ode(eq, func, dict=True)
File "/home/ondrej/repos/sympy/sympy/solvers/ode.py", line 746, in classify_ode
    r = _nth_linear_match(reduced_eq, func, order)
File "/home/ondrej/repos/sympy/sympy/solvers/ode.py", line 2182, in _nth_linear_match
    terms[len(f.args[1:])] += c
KeyError: 2


I assume some syntax has changed in the solve() function, or maybe it stopped supporting that particular ODE (that one gets in the example), whose implementation was a bit hackish anyway.

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