Question

There is a DataFrame ‘modtso’:

In [4]: modtso
Out[4]: 
<class 'pandas.core.frame.DataFrame'>
DatetimeIndex: 74006 entries, 2002-07-27 15:00:00 to 2010-12-31 22:58:08
Data columns:
0    74006  non-null values
dtypes: float32(1)

In [5]: modtso[1:10]
Out[5]: 
                         0
2002-07-27 16:01:53   9.336845
2002-07-27 16:58:08   9.337487
2002-07-27 18:00:00   9.343308
2002-07-27 19:01:53   9.364368
2002-07-27 19:58:08   9.389445
...

Now I want to resample it as below:

a=modtso.resample('D',how='std')

it will raise a exception:

ValueError: Buffer dtype mismatch, expected 'float64_t' but got 'float'

what’s the problem? how can I fix it?
thanks

Answer 1

this is fully supported on 0.11-dev
in 0.10 I think it will work, but your float32 will become float64 for almost any operation

and FYI to convert types explicitly

df.astype('float64')

see the examples here
http://pandas.pydata.org/pandas-docs/dev/whatsnew.html#v0-11-0-march-2013