This is not, in fact, a bug although I've fallen prey to the same mistake myself. I'm assuming what you really wanted was to use logical_and: Python 2.2.1 (#1, Apr 29 2002, 15:21:53) [GCC 3.0.3] on linux2 Type "help", "copyright", "credits" or "license" for more information.
from Numeric import * a = array((1,1), 'b') b = array((1,0), 'b') logical_and(a,b) array([1, 0],'b') logical_and(b,a) array([1, 0],'b')
From the python documentation:
"The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned." So the "and" is just returning its second argument, since both arguments are considered "True" (containing at least 1 "True" element). On Tue, 2002-06-11 at 23:27, Geza Groma wrote:
Using Numeric-21.0.win32-py2.2 I found this:
Python 2.2.1 (#34, Apr 9 2002, 19:34:33) [MSC 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information.
from Numeric import * a = array((1, 1), 'b') b = array((1, 0), 'b') a and b array([1, 0],'b') b and a array([1, 1],'b')
It looks like a bug, or at least very weird. a&b and b&a work correctly.
-- Géza Groma Institute of Biophysics, Biological Research Center of Hungarian Academy of Sciences Temesvári krt.62. 6726 Szeged Hungary phone: +36 62 432 232 fax: +36 62 433 133
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