On Nov 1, 2005, at 3:09 AM, Robert Cimrman wrote:
David M. Cooke wrote:
On Oct 31, 2005, at 07:37, Alan G Isaac wrote:
On Mon, 31 Oct 2005, Robert Cimrman apparently wrote:
is this the expected behaviour? IMHO (b * c) == (b and c), (b + c) == (b or c) should hold...
I expected the Boolean operations to yield element-by-element comparisons. What are they?? In contrast, the + and * operators give the expected results.
Use & and | instead of 'and' and 'or'.
Thanks, this works as expected. Is there a place where such things are documented? I suspect many people would expect 'and' and '&' to have the same behaviour. Of course, looking at the numeric operations special methods should reveal the problem, but who would do it ;)
This is what I usually tell people. But do note doing it this way can bite people on occasion. This works if the arguments are boolean arrays or values. But if they aren't the operations are bitwise and thus may result in surprising results. Perry Greenfield