Hi everyone:
I use COIN in sage to solve a linear programming. And I need the answer to be in fraction, but the default is not factional. That's to say I need the answer
\frac{1}{3}
not
`0.3333....` ,
so, how can I get the answer I need ?
The arbitrary precision linear programming backend is not yet merged, but you can get it from http://trac.sagemath.org/12533
According to http://www.sagemath.org/doc/reference/sage/libs/ppl.html (to which the above link points), PPL computes in QQ.
You can't in general, without making some further assumptions -- how do you know that the answer really isn't 33333/100000?
If you want a sort of best-guess fraction, you can use the Farey sequence and the Sage function farey:
sage: farey(0.3333, 1)
(0, 1)
sage: farey(0.3333, 2)
(0, 1)
sage: farey(0.3333, 3)
(1, 3)
sage: farey(0.3333, 100)
(1, 3)
Asked: 2012-10-02 01:00:17 +0100
Seen: 300 times
Last updated: Oct 02 '12
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