[Numpy-discussion] possible bug in concatenating character arrays
Nadav Horesh
nadavh at visionsense.com
Sun Sep 5 02:45:12 EDT 2004
It works without any problem under numarray 1.1 (from CVS) and python 2.3.4 and 2.4.a2 under RH9
Nadav.
-----Original Message-----
From: Faheem Mitha [mailto:faheem at email.unc.edu]
Sent: Sun 05-Sep-04 04:45
To: numpy-discussion at lists.sourceforge.net
Cc:
Subject: [Numpy-discussion] possible bug in concatenating character arrays
The following recipe gives a segmentation fault.
************************************************************************
In [1]: import numarray.strings as numstr
In [2]: foo = numstr.array("acgttatcgt", shape=(3,3))
In [3]: foo[0] + foo[1]
Segmentation fault
*************************************************************************
It works if instead one does:
*************************************************************************
In [4]: a = foo[0]
In [5]: b = foo[1]
In [6]: a
Out[6]: CharArray(['a', 'c', 'g'])
In [7]: b
Out[7]: CharArray(['t', 't', 'a'])
In [8]: a + b
Out[8]: CharArray(['at', 'ct', 'ga'])
***************************************************************************
In the case of numerical arrays, either method works.
In [9]: bar = numarray.array(range(9), shape=(3,3))
In [10]: bar
Out[10]:
array([[0, 1, 2],
[3, 4, 5],
[6, 7, 8]])
In [11]: a = bar[0]
In [12]: b = bar[1]
In [13]: a + b
Out[13]: array([3, 5, 7])
In [14]: bar[0] + bar[1]
Out[14]: array([3, 5, 7])
************************************************************
If this is a bug (I'd appreciate confirmation of this), should I
report to the bug tracking system? Please cc me, I'm not subscribed.
Faheem.
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