[Numpy-discussion] Indexing with weave

Barry Wark barrywark at gmail.com
Mon Jan 8 19:09:11 CST 2007


oops. and it works in test(). sorry. my eyes aren't what they used to be :)

On 1/8/07, Keith Goodman <kwgoodman at gmail.com> wrote:
> On 1/8/07, Barry Wark <barrywark at gmail.com> wrote:
> > I think you want
> > y = x[0,i]
>
> I followed the weave.inline example at
>
> http://www.scipy.org/PerformancePython
>
> which uses the C-like x(i,j) instead of the numpy x[i,j].
>
> Changing test2 to y = x[0,i] gives "TypeError: cannot convert value to
> double" on the weave.inline line.
>
> > On 1/8/07, Keith Goodman <kwgoodman at gmail.com> wrote:
> > > My first weave attempt weaves something to be desired.
> > >
> > > test() works, but test2() doesn't.
> > >
> > > It complains about the line "y = x(0,i);"
> > >
> > > In function 'PyObject* compiled_func(PyObject*, PyObject*)':
> > > blah.cpp:667: error: no match for call to '(py::object) (int, int&)'
> > >
> > > I am no match for that error message. What am I doing wrong?
> > >
> > > from scipy import weave
> > > from scipy.weave import converters
> > > import numpy.matlib as M
> > >
> > > def test(i):
> > >     x = M.matrix([[1.0, 2.0, 3.0]]);
> > >     code =  """
> > >             return_val = x(0,i);
> > >             """
> > >     y = weave.inline(code, ['x', 'i'], type_converters=converters.blitz)
> > >     return y
> > >
> > > def test2(i):
> > >     x = M.matrix([[1.0, 2.0, 3.0]]);
> > >     code =  """
> > >             double y;
> > >             y = x(0,i);
> > >             return_val = y;
> > >             """
> > >     y = weave.inline(code, ['x', 'i'], type_converters=converters.blitz)
> > >     return y
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