[Numpy-discussion] Cython error with complex numpy array

arrigo arrigo.benedetti at gmail.com
Fri Apr 15 20:59:01 EDT 2011

I am trying to use Cython to speed up some calculation with complex
numpy arrays and I am getting this error:

C:>python setup_post.py build_ext --inplace
running build_ext
cythoning SVDc_post.pyx to SVDc_post.c

Error converting Pyrex file to C:

# static inline Real csq(cComplex x) { return creal(x*conj(x)); }
cdef inline double csq(x): return real(x*x.conjugate())

def SVDc2(int m, int n,

C:\SVDc_post.pyx:11:0: Compiler crash in IntroduceBufferAuxiliaryVars

ModuleNode.body = StatListNode(SVDc_post.pyx:2:0)
StatListNode.stats[4] = StatListNode(SVDc_post.pyx:11:0)
StatListNode.stats[0] = DefNode(SVDc_post.pyx:11:0,
   modifiers = [...]/0,
   name = u'SVDc2',
   num_required_args = 7,
   reqd_kw_flags_cname = '0')

The code is below (I removed all the code not relevant to this error):

import numpy as np
cimport numpy as np

ctypedef np.float64_t dtype_t

cdef inline double csq(x): return real(x*x.conjugate())

def SVDc2(int m, int n,
              np.ndarray[np.complex128_t, ndim = 2] Ao,
              np.ndarray[np.float64_t, ndim = 1] d,
              np.ndarray[np.complex128_t, ndim = 2] Vo,
              np.ndarray[np.complex128_t, ndim = 2] Wo,
              int sort):

   cdef dtype_t EPS = 1.5e-31
   cdef dtype_t DBL_EPS = 2.2204460492503131e-16

   cdef int maxsweeps = 50
   cdef int err = True

   cdef int     rev = ((m - n) >> 15) & 1
   cdef int     nm = min(m, n)
   cdef int     nx = max(m, n)
   cdef dtype_t red = .01 / (nx * nx * nx * nx)
   cdef int     ldV = nx
   cdef int     ldW = nx
   cdef int     ldA = nx
   cdef dtype_t thresh = 0.0

   cdef np.ndarray[np.complex128_t, ndim=3] VW = zeros((3, nx, nx),

   cdef np.ndarray[np.int32, ndim=1] ppi = empty(nm, dtype=int32)

   for p in range(0, nx): VW[0, p, p] = 1
   for p in range(0, nx): VW[1, p, p] = 1

   if rev:
       for q in range(0, m):
           for p in range(0, n):
               VW[2, p, q] = Ao[q, p]
       for q in range(0,m):
           for p in range(0,n):
               VW[2, q, p] = Ao[q, p]


I was wondering if I need a special setup.py when using numpy arrays.
Any ideas?



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