On Thu, Sep 15, 2011 at 12:07 PM, Robert Bradshaw
<rober...@math.washington.edu> wrote:
> On Wed, Sep 14, 2011 at 2:31 AM, Rajeev Singh <rajs2...@gmail.com> wrote:
>> Hi,
>>
>> The following examples compiles from the notebook
>>
>> %cython
>> cimport sage.gsl.ode
>> import sage.gsl.ode
>> include 'gsl.pxi'
>>
>> cdef class van_der_pol(sage.gsl.ode.ode_system):
>> cdef double beta
>> def __cinit__(self, double beta=1.0):
>> self.beta = beta
>> cdef int c_f(self,double t, double *y,double *dydt):
>> dydt[0]=y[1]
>> dydt[1]=-y[0]-self.beta*y[1]*(y[0]*y[0]-1)
>> return GSL_SUCCESS
>> cdef int c_j(self, double t,double *y,double *dfdy,double *dfdt):
>> dfdy[0]=0
>> dfdy[1]=1.0
>> dfdy[2]=-2.0*10*y[0]*y[1]-1.0
>> dfdy[3]=-10*(y[0]*y[0]-1.0)
>> dfdt[0]=0
>> dfdt[1]=0
>> return GSL_SUCCESS
>>
>> However if I put it in a file vander.pyx (say) and use the following
>> setup.py -
>>
>> from distutils.core import setup
>> from distutils.extension import Extension
>> from Cython.Distutils import build_ext
>>
>> ext = Extension("vander", ["vander.pyx"],
>> include_dirs = ['/home/rajeev/bin/sage/devel/sage-main/sage/gsl/'])
>>
>> setup(ext_modules=[ext],
>> cmdclass = {'build_ext': build_ext})
>>
>>
>> I get the following error -
>>
>> cdef class van_der_pol(sage.gsl.ode.ode_system):
>> ^
>> ------------------------------------------------------------
>>
>> vander.pyx:10:5: 'ode_system' is not declared
>>
>>
>> I guess the problem is with the setup.py. Can someone tell me how to do this?
>
> IIRC, the notebook %cython creates a setup.py--you could just look at
> that. Chances are your Extension object is missing include dirs and
> libraries.
>
> -Robert
>
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>
Hi,
The present script takes a pyx file as input and outputs a c, o and so
file in the same directory. The so can now be imported in a sage
program. I have already checked it and its seems to be working fine. I
did look at the commands generated by setup.py file to write this
script.
Rajeev
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