[SciPy-dev] Object array comparisons, Monte Carlo package
Travis Oliphant
oliphant.travis at ieee.org
Mon Jan 16 17:06:49 EST 2006
Ed Schofield wrote:
>Hi Travis,
>
>I'm finding object arrays useful with the new syntax. +1 from me :)
>
>I have a feature request. Object arrays currently don't support rich
>(elementwise) comparisons:
>
>
Well, they actually do. But, there is some code left-over from Numeric
that is not working the same way now that there are string arrays
available.
>
>
>>>>d = {'a':10,'b':20,'c':30}
>>>>s = montecarlo.dictsampler(d)
>>>>s.sample(10000)
>>>>
>>>>
>array([c, c, b, ..., c, c, b], dtype=object)
>
>
>>>>s == 'b'
>>>>
>>>>
>False
>
>Could we enable this again?
>
I never disabled it. Consider s == array('b', object)
The problem is that 'b' is being interpreted as a string array and that
is returning False (probably due to special code in the rich_compare
function.
I need to re-look at the code in the Py_EQ section of array_richcompare
to make sure it is not special-casing inappropriately...
-Travis
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