[Numpy-discussion] How to concatenate 2 recarrays into a single recarray

Isaac Gerg isaac.gerg at gergltd.com
Thu May 11 14:52:21 EDT 2017


Looking at the code, i think merge and stack take in ndarrays, not recarrays
is that correct?

On Thu, May 11, 2017 at 2:34 PM, Isaac Gerg <isaac.gerg at gergltd.com> wrote:

> Sure.
>
> On Thu, May 11, 2017 at 2:31 PM, Eric Wieser <wieser.eric+numpy at gmail.com>
> wrote:
>
>> If that's the case, can you file an issue on github along with a minimal
>> example that produces the error, and the full stack trace?
>>
>> On Thu, 11 May 2017 at 19:29 Isaac Gerg <isaac.gerg at gergltd.com> wrote:
>>
>>> newtable = np.lib.recfunctions.merge_arrays([a, b], asrecarray=True)
>>>
>>> yeilds:
>>>
>>> builtins.SystemError: ..\Objects\dictobject.c:2054: bad argument to
>>> internal function
>>>
>>> On Thu, May 11, 2017 at 2:02 PM, Benjamin Root <ben.v.root at gmail.com>
>>> wrote:
>>>
>>>> Check in numpy.recfunctions. I know there is merge_arrays() and
>>>> stack_arrays(). I forget which one does what.
>>>>
>>>> Cheers!
>>>> Ben Root
>>>>
>>>>
>>>> On Thu, May 11, 2017 at 1:51 PM, Isaac Gerg <isaac.gerg at gergltd.com>
>>>> wrote:
>>>>
>>>>> I'd prefer to stay in numpy land if possible.
>>>>>
>>>>> On Thu, May 11, 2017 at 1:17 PM, Isaac Xin Pei <isaacpei at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Check Pandas pd.concate ?
>>>>>> On Thu, May 11, 2017 at 12:45 PM Isaac Gerg <isaac.gerg at gergltd.com>
>>>>>> wrote:
>>>>>>
>>>>>>> I have 2 arrays, a and b which are rec arrays of length 10.  Each
>>>>>>> array has 5 columns.
>>>>>>>
>>>>>>> I would like to combine all the columns into a single recarray with
>>>>>>> 10 columns and length 10.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Isaac
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>>>>>>
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