On 18/10/2012 15:00, Kenneth A. Ribet wrote:
Hi Sage Gurus,
Am I doing something stupid here:
sage: print 1/2 < 3/7
sage: L=[]
sage: for i in range(2,3):
... for j in range(1,2):
... L.append([i,j])
...
sage: print L
sage: for P in L:
... print P[1], P[0]
... P[1]/P[0] < 3/7
False
[[2, 1]]
1 2
True
----
In plain language:
I ask sage whether 1/2 is less than 3/7, and sage tells me "false."
I then create the list L = [[2,1]] and loop through L (which has only one element). For P=[2,1], I ask sage
whether P[1]/P[0] is less than 3/7 and get "true". The conundrum is that P[1]/P[0] is 1/2, so
mathematically I'm getting the answers "false" and then "true" for the same question.
I don't have time to check, but I think the problem is that your list
elements are created as Python integers rather than Sage integers.
Therefore, the / operator does integer part tivision, that is p[1]/p[0]
is evaluating to 0, hence the comparison is correct.
Alastair Irving
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To post to this group, send email to sage-support@googlegroups.com.
To unsubscribe from this group, send email to
sage-support+unsubscr...@googlegroups.com.
Visit this group at http://groups.google.com/group/sage-support?hl=en.
