[SciPy-User] find particular day_of_week

josef.pktd@gmai... josef.pktd@gmai...
Wed Jan 27 15:25:45 CST 2010


On Wed, Jan 27, 2010 at 4:18 PM, Robert Ferrell <ferrell@diablotech.com> wrote:
> I have a time series, I want to operate (read only) on all the items
> with a particular day_of_week.  What is an efficient way to get at
> those?
>
> I've tried:
>
>                desiredDates = [dt for dt in myTS.dates if dt.day_of_week ==
> day_of_week]
>
>                 desiredSeries = myTS[desiredDates]
>
> but that seems quite slow.  The second line is the one which is taking
> all the time.  Is there a faster way?  I don't need a copy, just a
> view, if that helps.

I think numpy-discussion jan 20th  "dates, np.where finding months"
answers this.

Josef


>
> thanks,
> -robert
>
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