[Numpy-discussion] array of tuples
David M. Cooke
cookedm at physics.mcmaster.ca
Tue Jun 6 16:07:05 CDT 2006
On Tue, 06 Jun 2006 13:21:56 -0700
Christopher Barker <Chris.Barker at noaa.gov> wrote:
>
>
> Travis N. Vaught wrote:
> > I'd like to construct an array of tuples and I'm not sure how (without
> > looping).
>
> Is this what you want?
>
> >>> import numpy as N
> >>> a = N.empty((2,),dtype=object)
> >>> a[:] = [(1,2,3),(4,5,6)]
> >>> a
> array([(1, 2, 3), (4, 5, 6)], dtype=object)
> >>> a.shape
> (2,)
>
> By the way, I notice that the object dtype is not in the numpy
> namespace. While this mikes sense, as it's part of python, I keep
> getting confused because I do need to use numpy-specific dtypes for
> other things. I never use import *, so it might be a good idea to put
> the standard objects dtypes in the numpy namespace too. Or maybe not,
> just thinking out loud.
None of the Python types are (int, float, etc.). For one reason, various
Python checkers complain about overwriting a builtin type, and plus, I
think it's messy and a potential for bugs. numpy takes those as convenience
types, and converts them to the appropriate dtype. If you want the dtype
used, it's spelled with an appended _.
So in this case you'd want dtype=N.object_. N.object0 works too.
--
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|David M. Cooke http://arbutus.physics.mcmaster.ca/dmc/
|cookedm at physics.mcmaster.ca
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