Comment #14 on issue 317 by asmeurer: factor() slow
http://code.google.com/p/sympy/issues/detail?id=317
With new polys:
SYMPY_GROUND_TYPES=sympy:
In [1]: a,b,c,d,x = symbols('abcdx')
In [2]: %timeit factor(a-x)
1000 loops, best of 3: 1.37 ms per loop
In [3]: %timeit factor(a*b-x)
100 loops, best of 3: 2.48 ms per loop
In [4]: %timeit factor(a*b-x**2)
100 loops, best of 3: 5.35 ms per loop
In [5]: %timeit factor(a*b-c*x**2)
100 loops, best of 3: 9.22 ms per loop
In [6]: %timeit factor(a*b-c*d*x**2)
10 loops, best of 3: 18.8 ms per loop
SYMPY_GROUND_TYPES=gmpy:
In [1]: a,b,c,d,x = symbols('abcdx')
In [2]: %timeit factor(a-x)
1000 loops, best of 3: 959 us per loop
In [3]: %timeit factor(a*b-x)
1000 loops, best of 3: 1.75 ms per loop
In [4]: %timeit factor(a*b-x**2)
100 loops, best of 3: 2.87 ms per loop
In [5]: %timeit factor(a*b-c*x**2)
100 loops, best of 3: 5.03 ms per loop
In [6]: %timeit factor(a*b-c*d*x**2)
100 loops, best of 3: 9.21 ms per loop
So can this be closed?
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