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POPassing a pointer to a struct in cython
 

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    <p>I'm attempting to write a cython interface to the complex version of the MUMPS solver (zmumps). I'm running into some problems as I have no previous experience with either C or cython. Following the example of the <a href="https://github.com/bfroehle/pymumps" rel="nofollow">pymumps package</a> I was able to get the real version of the code (dmumps) to work. </p> <p>I believe that my problem are the pointers to the ZMUMPS_COMPLEX structures. For the </p> <p>So far I have the following (lifted heavily from <a href="https://github.com/bfroehle/pymumps" rel="nofollow">pymumps</a>):</p> <p><strong>zmumps_c.pxd:</strong></p> <pre><code>from libc.string cimport strncpy cdef extern from "mumps_c_types.h": ctypedef struct ZMUMPS_COMPLEX "ZMUMPS_COMPLEX": double r double i cdef extern from "zmumps_c.h": ctypedef int MUMPS_INT ctypedef struct c_ZMUMPS_STRUC_C "ZMUMPS_STRUC_C": MUMPS_INT sym, par, job MUMPS_INT comm_fortran # Fortran communicator MUMPS_INT n # Assembled entry MUMPS_INT nz MUMPS_INT *irn MUMPS_INT *jcn ZMUMPS_COMPLEX *a # RHS and statistics ZMUMPS_COMPLEX *rhs MUMPS_INT infog[40] void c_zmumps_c "zmumps_c" (c_ZMUMPS_STRUC_C *) </code></pre> <p><strong>zmumps_c.pyx</strong></p> <pre><code>cdef class ZMUMPS_STRUC_C: cdef c_ZMUMPS_STRUC_C ob property sym: def __get__(self): return self.ob.sym def __set__(self, value): self.ob.sym = value property par: def __get__(self): return self.ob.par def __set__(self, value): self.ob.par = value property job: def __get__(self): return self.ob.job def __set__(self, value): self.ob.job = value property comm_fortran: def __get__(self): return self.ob.comm_fortran def __set__(self, value): self.ob.comm_fortran = value property n: def __get__(self): return self.ob.n def __set__(self, value): self.ob.n = value property nz: def __get__(self): return self.ob.nz def __set__(self, value): self.ob.nz = value property irn: def __get__(self): return &lt;long&gt; self.ob.irn def __set__(self, long value): self.ob.irn = &lt;MUMPS_INT*&gt; value property jcn: def __get__(self): return &lt;long&gt; self.ob.jcn def __set__(self, long value): self.ob.jcn = &lt;MUMPS_INT*&gt; value property a: def __get__(self): return &lt;long&gt; self.ob.a def __set__(self, long value): self.ob.a = &lt;ZMUMPS_COMPLEX*&gt; value property rhs: def __get__(self): return &lt;long&gt; self.ob.rhs def __set__(self, long value): self.ob.rhs = &lt;ZMUMPS_COMPLEX*&gt; value property infog: def __get__(self): cdef MUMPS_INT[:] view = self.ob.infog return view def zmumps_c(ZMUMPS_STRUC_C s not None): c_zmumps_c(&amp;s.ob) </code></pre> <p>In my python code I'm able to set the irn and jcn using</p> <pre><code>import zmumps_c import numpy as np MUMPS_STRUC_C = staticmethod(zmumps_c.ZMUMPS_STRUC_C) id = MUMPS_STRUC_C() x = np.r_[1:10] id.irn = x.__array_interface__['data'][0] </code></pre> <p>However, I have no idea how to set the values of a or rhs. Any help would be greatly appreciated.</p>
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