On Sun, Jul 24, 2011 at 5:47 PM, john_perry_usm <[email protected]> wrote:
> I want to declare c to be of the type defined by the class Rational.
> I'm sure this is easy, but what I want to do is this:
>
> from sage.rings.rational import Rational
> cdef Rational c
>
> but that doesn't work. Neither does cimport (which I found in a file
> somewhere, albeit commented out, and now I know why).
>
Actually,
from sage.rings.rational cimport Rational
*does* work, but you have to put it in the right place. As an illustration,
try this in the notebook:
%cython
from sage.rings.rational cimport Rational
def f(Rational c, s):
cdef Rational dummy = Rational('2/3') # just for illustrative purposes
print dummy
mpq_set_str(c.value, s, 10)
Then in the next cell put this:
c = 8/7
f(c, '5/3')
print c
-- William
>
> regards
> john perry
>
> --
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--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org
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