Comment #2 on issue 1577 by asmeurer: match doesn't put every wild as a key
http://code.google.com/p/sympy/issues/detail?id=1577
Well, you can see line 577 in ode.py for what I ended up doing:
if r and r[c] != 0 and r[n] != 1: # See issue 1577
The .get method might make things a little simpler by avoiding having to
structure the condition so that it breaks before
raising KeyError.
"but do you mean to do it if n cannot possibly be 1,
or if n can be different from 1?" Maybe it is too early in the morning, but
these sound like the same thing to me. Can you
clarify?
At any rate, it still seems to me that making r[n] == None or something
would be better than not putting it in the
dictionary at all.
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