Lionel Roubeyrie wrote:
> Hi all,
> I don't understand why can't I do that:
> b=array([(datetime.datetime(2006,11,29),'2','3'),
> (datetime.datetime(2006,11,30),'5','6')], dtype=[('Dates', 'object'),
> ('HUM', 'float32'), ('TEM', 'float32')])
> ValueError: tried to set void-array with object members using buffer.
> Thanks
I'm not sure why this fails, but it does work if you create an empty
array, then set the values individually:
>>> a = N.empty((2,),dtype = [('Dates', 'object'),('HUM', 'float32'),
('TEM', 'float32')])
>>> a
array([(None, 0.0, 0.0), (None, 0.0, 0.0)],
dtype=[('Dates', '|O4'), ('HUM', '>f4'), ('TEM', '>f4')])
>>> a[0]['Dates'] = datetime.datetime(2006,11,29)
>>> a[0]['HUM'] = 2
>>> a[0]['TEM'] = 3
>>> a
array([(datetime.datetime(2006, 11, 29, 0, 0), 2.0, 3.0), (None, 0.0,
0.0)], dtype=[('Dates', '|O4'), ('HUM', '>f4'), ('TEM', '>f4')])
Both recarrays and working the object data type are tricky.
-Chris
--
Christopher Barker, Ph.D.
Oceanographer
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