python - Calling numpy function from C-code -


i'm trying move matlab code mex extensions python numpy , scipy libraries. using wonderful tutorial http://www.scipy.org/cookbook/c_extensions/numpy_arrays, quite adopt c-functions calling python. c-functions call matlab functions, have substitute code calling numpy , scipy functions c-code.

i've tried extending , embedding python interpreter. however, faced problem: how pass array function argument. long way find function in module , build tuple arguments doesn't seems elegant.

so, how call sum function in numpy module c-code, example?

i'll appreciate ideas or links. ruben

p.s. here example:

    pyobject *feedback(pyobject *self, pyobject *args){     pyarrayobject *vecin;     double mp=0,ret;     if( !pyarg_parsetuple(args,"o!d",&pyarray_type,&vecin,&mp)       ||  vecin == null ) return null;     /* make python string module name */     pyobject *pname = pystring_fromstring("numpy");     if( pname == null){         fprintf(stderr,"couldn\'t setup string %s\n","numpy");         return null;     }     /* import module */     pyobject *pmodule = pyimport_import(pname);     py_decref(pname);     if( pmodule == null){         fprintf(stderr,"couldn\'t find module %s\n","numpy");         return null;     }     /* module dict */     pyobject *dic = pymodule_getdict(pmodule);     if( dic == null){         fprintf(stderr,"couldn\'t find dic in module %s\n","numpy");         return null;     }     /* find function */     pyobject *pfunction = pydict_getitemstring(dic, "sum");     py_decref(dic);     if( pfunction == null){         fprintf(stderr,"couldn\'t find function  %s in dic\n","sum");         return null;     }     py_decref(pmodule);     /* create typle new function argument */     pyobject *inarg = pytuple_new(1);     if( inarg == null){         fprintf(stderr,"cannot convert build in value\n");         return null;     }     /* set 1 input paramter */     pytuple_setitem(inarg, 0, (pyobject*)vecin);     /* call sunction module , result*/     pyobject *value = pyobject_callobject(pfunction, inarg);     if( value == null){         fprintf(stderr,"function return null pointer\n");         return null;     }     py_decref(pfunction);     if( !pyarg_parsetuple(value,"d",&ret) ) return null;     return py_buildvalue("d",ret*mp); }

result of

>>print mymod.feedback(np.array([1.,2.,3.,4.,5.]),2)   traceback (most recent call last):   file "mymodtest.py", line 10, in <module>     print mymod.feedback(np.array([1.,2.,3.,4.,5.]),2) systemerror: new style getargs format argument not tuple segmentation fault

the numpy c api has pyarray_sum:

pyobject *sum = pyarray_sum(arr, npy_maxdims, pyarray_descr(arr)->type_num, null);

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