Re: [Pytables-users] Column gets updated but table does not reflect

[Alvaro T. C. <al...@mi...>]

I am now on another computer (no access to the one where I reported
the problem until tomorrow; uses 2.3.1 AFAIK) and here I have the
expected behaviour (2.3.1, as well). I hope that I made a mistake;
will update tomorrow.


-á.


On Mon, Apr 30, 2012 at 20:09, Francesc Alted <fa...@py...> wrote:
> On 4/30/12 12:08 PM, Alvaro Tejero Cantero wrote:
>> Hi all,
>>
>> I created a table:
>>
>>>>> joins.createTable('/','spikes',{'t20k':pt.Int32Col(),'tetrode':pt.UInt8Col(), 'unit':pt.UInt8Col()},'Spike times')
>> I populated it
>>
>>>>> joins.root.spikes.append(zip(np.arange(100),np.zeros(100), 3*np.ones(100)))
>> now if I do
>>
>>>>> joins.root.spikes.cols.tetrode[:] = np.ones(100)
>> I can see the updated value (all ones instead of zeros)
>>
>> If I fetch all the table in memory,
>>
>>>>> joins.root.spikes[:]
>> I still see only the original zeros, i.e. the column update has not propagated
>
> Hmm, I cannot reproduce this:
>
> In [18]: joins = pt.openFile("joins.h5", "w")
>
> In [19]:
> joins.createTable('/','spikes',{'t20k':pt.Int32Col(),'tetrode':pt.UInt8Col(),
> 'unit':pt.UInt8Col()},'Spike times')
> Out[19]:
> /spikes (Table(0,)) 'Spike times'
>   description := {
>   "t20k": Int32Col(shape=(), dflt=0, pos=0),
>   "tetrode": UInt8Col(shape=(), dflt=0, pos=1),
>   "unit": UInt8Col(shape=(), dflt=0, pos=2)}
>   byteorder := 'little'
>   chunkshape := (10922,)
>
> In [20]: joins.root.spikes.append(zip(np.arange(10),np.zeros(10),
> 3*np.ones(10)))
>
> In [22]: joins.root.spikes[:]
> Out[22]:
> array([(0, 0, 3), (1, 0, 3), (2, 0, 3), (3, 0, 3), (4, 0, 3), (5, 0, 3),
>        (6, 0, 3), (7, 0, 3), (8, 0, 3), (9, 0, 3)],
>       dtype=[('t20k', '<i4'), ('tetrode', 'u1'), ('unit', 'u1')])
>
> In [23]: joins.root.spikes.cols.tetrode[:] = np.ones(10)
>
> In [24]: joins.root.spikes[:]
> Out[24]:
> array([(0, 1, 3), (1, 1, 3), (2, 1, 3), (3, 1, 3), (4, 1, 3), (5, 1, 3),
>        (6, 1, 3), (7, 1, 3), (8, 1, 3), (9, 1, 3)],
>       dtype=[('t20k', '<i4'), ('tetrode', 'u1'), ('unit', 'u1')])
>
> Which versions are you using?
>
> --
> Francesc Alted
>
>
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