[Numpy-discussion] numpy sort is not working

Anthony Scopatz scopatz@gmail....
Tue Sep 11 01:03:53 CDT 2012


On Tue, Sep 11, 2012 at 12:52 AM, Jadhav, Alok <
alok.jadhav@credit-suisse.com> wrote:

> Hi Travis,****
>
> ** **
>
> Very Strange. I am on version 1.6.2 L****
>
> What could I be missing. I started using numpy quite recently. Is there a
> way to share the data with you?
>

Hi Alok,

Typically, a self-contained example which reproduces the error and
generates its own data is more useful / valuable than sharing datasets.  if
you could come up with this, that'd be great!

Be Well
Anthony


> ****
>
> ** **
>
> Regards,****
>
> ** **
>
> Alok Jadhav****
>
> GAT IT Hong Kong****
>
> +852 2101 6274 (*852 6274)****
>
> ** **
>
> *From:* numpy-discussion-bounces@scipy.org [mailto:
> numpy-discussion-bounces@scipy.org] *On Behalf Of *Travis Oliphant
> *Sent:* Tuesday, September 11, 2012 11:58 AM
> *To:* Discussion of Numerical Python
> *Subject:* Re: [Numpy-discussion] numpy sort is not working****
>
> ** **
>
> Hey Alok, ****
>
> ** **
>
> This is worth taking a look.   What version of NumPy are you using?  ****
>
> ** **
>
> It is not related directly to the issue you referenced as that was an
> endian-ness issue and your data is native-order.   ****
>
> ** **
>
> Your example seems to work for me (with a simulated case on 1.6.1)****
>
> ** **
>
> Best,****
>
> ** **
>
> -Travis****
>
> ** **
>
> ** **
>
> On Sep 10, 2012, at 10:46 PM, Jadhav, Alok wrote:****
>
>
>
> ****
>
>  ****
>
> Hi everyone,****
>
>  ****
>
> I have a numpy array of dimensions****
>
>  ****
>
> >>> allRics.shape
> (583760, 1) ****
>
>  ****
>
> To sort the array, I set the dtype of the array as follows:****
>
>  ****
>
> allRics.dtype = [('idx', np.float), ('opened', np.float), ('time', np.
> float),('trdp1',np.float),('trdp0',np.float),('dt',np.float),('value',np.
> float)] ****
>
> >>> allRics.dtype****
>
> dtype([('idx', '<f8'), ('opened', '<f8'), ('time', '<f8'), ('trdp1',
> '<f8'), ('trdp0', '<f8'), ('dt', '<f8'), ('value', '<f8')])****
>
>  ****
>
> I checked and the endianness in dtype is correct.****
>
>  ****
>
> When I sort the array, the output array of sort is same as original array
> without any change. I want to sort the allRics numpy array on ‘time’. I do
> the following.****
>
>  ****
>
> >>> x=np.sort(allRics,order='time')****
>
> >>> x[17330:17350]['time']****
>
> array([[ 61184.4  ],****
>
>        [ 61188.51 ],****
>
>        [ 61188.979],****
>
>        [ 61188.979],****
>
>        [ 61189.989],****
>
>        [ 61191.66 ],****
>
>        [ 61194.35 ],****
>
>        [ 61194.35 ],****
>
>        [ 61198.79 ],****
>
>        [ 61198.145],****
>
>        [ 36126.217],****
>
>        [ 36126.217],****
>
>        [ 36126.218],****
>
>        [ 36126.218],****
>
>        [ 36126.219],****
>
>        [ 36126.271],****
>
>        [ 36126.271],****
>
>        [ 36126.271],****
>
>        [ 36126.293],****
>
>        [ 36126.293]])****
>
>  ****
>
> Time column doesn’t change its order. Could someone please advise what is
> missing here? Is this related to the bug****
>
> http://www.mail-archive.com/numpy-discussion@scipy.org/msg23060.html
> (from 2010).****
>
>  ****
>
> Regards,****
>
> Alok****
>
>  ****
>
>  ****
>
>  ****
>
>  ****
>
>  ****
>
> Alok Jadhav****
>
> *CREDIT SUISSE AG*****
>
> GAT IT Hong Kong, KVAG 67****
>
> International Commerce Centre | Hong Kong | Hong Kong****
>
> Phone +852 2101 6274 | Mobile +852 9169 7172****
>
> alok.jadhav@credit-suisse.com | www.credit-suisse.com****
>
>  ****
>
> ** **
>
>
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