[Numpy-discussion] RFC: A proposal for implementing some date/time types in NumPy
Fri Jul 11 13:01:39 CDT 2008
A Friday 11 July 2008, Pierre GM escrigué:
> On Fri, Jul 11, 2008 at 12:47 PM, Francesc Alted
> > A Friday 11 July 2008, Pierre GM escrigué:
> > > Our approach for dealing with dates was to translate them into
> > > integers through a particular class (Date).
> > That's very interesting. We will have a look at your
> > implementation and see if we can reuse code/ideas. I suppose this
> > code in your TimeSeries module, right?
> Yes, in the src directory (c_dates.c).
> In addition, we have a DateArray class, which implements an array of
> Dates (you didn't see that coming...) and whose dtype is int64.
> The reason why we wanted to stick to ints was to permit a direct
> correspondence index<->date in an array. If you know the first date
> and the timestep, you can get the date corresponding to any element
> of your series, and vice-versa.
Ah! Very smart! I wonder if we could use this to implement a special
array with a fixed timestep that could be indexed by time instead than
by index. Something like:
t1 = datetime.datetime(1,2,3)
t2 = datetime.datetime(3,4,5)
would select the events between t1 and t2 timestamps.
Powerful! But that would introduce more complexity and besides this is
not directly related with our goal. Interesting anyway.
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