On Feb 11, 2008 4:54 AM, Georg <[EMAIL PROTECTED]> wrote:
>
> Hi,
> using sage-2.10.1 on a 32-bit core duo with Debian Etch,
> considering 2 simple files,
> sa.sage:
>
> load "sb.spyx"
> def matmul(M):
> return M * (1/2)
spyx files are not "preparsed", so 1/2 is a Python "1/2", which is
just 0, since Python
does floor division on ints. You may want to put
return M * Integer(1)/Integer(2)
instead.
>
> sb.spyx:
>
> def matmulspyx(M):
> return M * (1/2)
>
> ----------------------------------------------------------------------
> | SAGE Version 2.10.1, Release Date: 2008-02-02 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
>
> sage: load "sa.sage"
> Compiling sb.spyx...
> sage: B = MatrixSpace(QQ, 2).identity_matrix()
> sage: C = MatrixSpace(RDF, 2).identity_matrix()
> sage: D = MatrixSpace(RR, 2).identity_matrix()
> sage: matmul(B)
>
> [1/2 0]
> [ 0 1/2]
> sage: matmul(C)
>
> [0.5 0.0]
> [0.0 0.5]
> sage: matmul(D)
>
> [0.500000000000000 0.000000000000000]
> [0.000000000000000 0.500000000000000]
> sage: matmulspyx(B)
>
> [0 0]
> [0 0]
> sage: matmulspyx(C)
>
> [0.0 0.0]
> [0.0 0.0]
> sage: matmulspyx(D)
>
> [0.000000000000000 0.000000000000000]
> [0.000000000000000 0.000000000000000]
>
> Must be a bug, or?
> thanks, Georg
>
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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