Comment #4 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
Even with the -o lex option, there are some less than ideal printing
orderings:
In [3]: x*cos(x) + cos(x) + x**2*cos(x) + cos(x**2) + x*cos(x**2) +
x**2*cos(x**2)
Out[3]:
2 2 ⎛ 2⎞ ⎛ 2⎞ ⎛ 2⎞
x ⋅cos(x) + x ⋅cos⎝x ⎠ + x⋅cos(x) + x⋅cos⎝x ⎠ + cos(x) + cos⎝x ⎠
And the worst thing is that it performs differently on 64-bit:
In [3]: x*cos(x) + cos(x) + x**2*cos(x) + cos(x**2) + x*cos(x**2) +
x**2*cos(x**2)
Out[3]:
⎛ 2⎞ 2 2 ⎛ 2⎞ ⎛ 2⎞
x⋅cos(x) + x⋅cos⎝x ⎠ + x ⋅cos(x) + x ⋅cos⎝x ⎠ + cos(x) + cos⎝x ⎠
By the way, can we implement something where I just set an environment
variable and it always runs with -o lex? I really hate the reverse
lexicographic ordering in printing.
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