[SciPy-user] timeseries.convert and structured arrays
Pierre GM
pgmdevlist at gmail.com
Wed Apr 29 13:21:29 EDT 2009
On Apr 29, 2009, at 10:10 AM, Dave Hirschfeld wrote:
> Hi,
> I ran into a problem using the convert function with a structured
> array (see
> below) so I just wanted to check if the timeseries function convert
> is intended
> to support structured arrays?
Doesn't work yet, sorry...
> If not are there any plans to do so?
When I'll have some time working on it, yes. Sometime this summer if
I'm lucky...
Meanwhile, you can emulate it by converting each field independently
and repatching the result
>>> data = ts.time_series(data,dates)
>>> mfield1 = data['field1'].convert("M")
>>> mdata = ts.time_series(np.empty(mfield1.shape, dtype=data.dtype),
... dates=mfield1.dates)
>>> mdata['field1'] = mfield1
>>> mdata['field2'] = data['field2'].convert("M")
> And if it
> does, what am I doing wrong below??
>
> Thanks,
> Dave
>
> dates = ts.date_array(start_date=ts.Date('D','2008-01-01'),
> end_date=ts.Date('D','2008-12-31'))
> #
>
> data = np.array(zip(np.random.rand(366),np.random.rand(366)),
> dtype=[('field1',np.float),('field2',np.object)])
> #
>
> data = ts.time_series(data,dates)
> data.convert('M')
>
>
>
> C:\dev\bin\Python25\lib\site-packages\scikits\timeseries\tseries.pyc
> in
> convert(series, freq, func, position, *args, **kwargs)
> 1999
> 2000 if series.ndim == 1:
> -> 2001 obj = _convert1d(series, freq, func, position,
> *args, **kwargs)
> 2002 elif series.ndim == 2:
> 2003 base = _convert1d(series[:,0], freq, func, position,
> *args,
> **kwargs)
>
> C:\dev\bin\Python25\lib\site-packages\scikits\timeseries\tseries.pyc
> in
> _convert1d(series, freq, func, position, *args, **kwargs)
> 1909
> 1910 cdictresult = cseries.TS_convert(data_, from_freq,
> to_freq, position,
> -> 1911 int(start_date), mask_)
> 1912 start_date = Date(freq=to_freq,
> value=cdictresult['startindex'])
> 1913 data_ = masked_array(cdictresult['values'],
> mask=cdictresult['mask'])
>
> ValueError: data type must provide an itemsize
>
>
>
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