On Sunday, July 24, 2011, john_perry_usm <john.pe...@usm.edu> wrote:
> What about not-the-notebook? :-) For example, I have the following
> file, called test_rational.pyx:
>
> from sage.rings.rational import Rational
import ---> cimport ?!
>
> cpdef Rational add(a, b):
> return a + b
>
> When I try to attach it to sage, I get: [lots of output removed]
>
> _home_perry_test_rational_pyx_1.pyx:8:6: 'Rational' is not a type
> identifier
>
> I get the same error with
>
> from sage.rings.rational import Rational
>
> cpdef Rational add(a, b):
> cdef Rational c
> c = a + b
> return c
>
> john
>
> On Jul 24, 7:53 pm, William Stein <wst...@gmail.com> wrote:
>> On Sun, Jul 24, 2011 at 5:47 PM, john_perry_usm <john.pe...@usm.edu>
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
>>
>> > --
>> > To post to this group, send email to sage-support@googlegroups.com
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>>
>> --
>> William Stein
>> Professor of Mathematics
>> University of Washingtonhttp://wstein.org
>
> --
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--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org
--
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