Comment #21 on issue 1923 by smichr: count_ops doesn't return a count (by
default)
http://code.google.com/p/sympy/issues/detail?id=1923
I'd be happy to put the pieces together under branch 1694. Having looked
back at comment 11 (after seeing your other work) I now understand what you
were suggesting and how you were suggesting doing it. That's clever. We'll
see what others think. If someone doesn't want the other ops they can just
substitute all symbols (other than ADD, MUL and POW) with 1 to get the same
result:
eq=(x+y+z); at=eq.atoms(Symbol); keep = set([x]); nil =
at.difference(keep)
eq.subs(zip(nil, [1]*len(nil)))
2 + x
It's a long "one liner"...perhaps a keyword "primary_ops" could be used
when visual is True to give just the ADD, MUL, POW (or vice version with a
flag 'verbose' to give what you propose in comment 11).
I've been able to apply your patches without problem, so if you post one I
can make the branch if you would like.
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