[Numpy-discussion] numpy sort is not working
Jadhav, Alok
alok.jadhav at credit-suisse.com
Tue Sep 11 01:52:57 EDT 2012
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?
Regards,
Alok Jadhav
GAT IT Hong Kong
+852 2101 6274 (*852 6274)
From: numpy-discussion-bounces at scipy.org
[mailto:numpy-discussion-bounces at 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 at credit-suisse.com | www.credit-suisse.com
<http://www.credit-suisse.com/>
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