[Numpy-discussion] fixed-point arithmetic

Neal Becker ndbecker2@gmail....
Fri Sep 25 13:57:15 CDT 2009


Robert Kern wrote:

> On Mon, Sep 21, 2009 at 12:39, Neal Becker <ndbecker2@gmail.com> wrote:
> 
>> 1. Where would I find this new datetime dtype?
> 
> It's in the SVN trunk.
> 
>> 2. Don't know exactly what 'parameterized' dtypes are.  Does this mean
>> that the dtype for 8.1 format fixed-pt is different from the dtype for
>> 6.2 format, for example?
> 
> Yes. The dtype code letter is the same, but the dtype object has
> metadata attached to it in the form of a dictionary. The ufunc loops
> get references to the array objects and will look at the dtype
> metadata in order to figure out exactly what to do.
> 

I'm still a bit confused.  The dtype is a PyTypeObject?  It almost sounds 
like you're saying that the dtype is an PyObject instance, rather than a 
TypeObject.  But IIUC, you say it is a PyTypeObject, but one with an extract 
dict attached (which kindof acts like an instance).



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