On Mon, Mar 23, 2009 at 4:03 PM, Robert Bradshaw <
rober...@math.washington.edu> wrote:

> On Mar 22, 2009, at 6:49 AM, Darren Dale wrote:
>
>  On Mar 20, 10:31 pm, Jason Grout <jason-s...@creativetrax.com> wrote:
>>
>>> Maurizio wrote:
>>>
>>>> Not yet... I think I was previously asking whether some of you guys
>>>> are interested in trying to contact them, if you do think it does
>>>> makes sense.
>>>>
>>>
>>>  I mean, if this community is interested in having this feature, the
>>>> Quantities developers are going to find some good feedback, otherwise,
>>>> we could just probably end up losing a good occasion, because things
>>>> are not ready yet (although I hope that's not the case)!
>>>>
>>>
>>> I think there are a good number of people now that would like to have
>>> the feature, and as you well know, there are lots and *lots* of future
>>> users that would like to have the functionality.
>>>
>>> I'd say it's time to contact them and see if they can help.  If there
>>> needs to be changes made to Quantities, then making them now, while it
>>> is still solidifying, would be advantageous.
>>>
>>
>> Hello, I am Darren Dale, the developer of Quantities. Thank you
>> Maurizio for contacting me.
>>
>
> Glad to hear from you.
>
> [...]
>
>  I guess the question I have for this list is, what would be required
>> for quantities to work in sage? I would prefer to try to work out the
>> numpy issues I alluded to before quantities gets too much exposure, in
>> case changes in API are required (unlikely).
>>
>
>
> Am I correct in understanding that the values in Quantities all need to be
> NumPy values? If this is the case, it probably boils down to NumPy's not
> handling of non-Python types. This really needs to get resolved.
>

Quantities values are all instances of Quantity or a subclass thereof, and
Quantity itself is a subclass of ndarray. It sounds like the first step
would be to work out this compatibility issue between sage objects and
ndarray. Has anyone brought it up at numpy-discussion?

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