[Numpy-discussion] Indexing with weave

Keith Goodman kwgoodman at gmail.com
Mon Jan 8 16:26:02 CST 2007


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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