Hi Hal,
On 2019-07-11, Hal Snyder <drxy...@gmail.com> wrote:
> sage: a = var('a')
> ....: matrix(GF(25, a), [[1,0], [0, 1]])
> ....:
> p025.zzz: No such file or directory
> ---------------------------------------------------------------------------
> RuntimeError Traceback (most recent call last)
><ipython-input-1-337d96d24b11> in <module>()
> 1 a = var('a')
> ----> 2 matrix(GF(Integer(25), a), [[Integer(1),Integer(0)], [Integer(0),
> Integer(1)]])
>
> /ext/sage/sage-8.8_1804/local/lib/python2.7/site-packages/sage/matrix/constructor.pyx
>
> in sage.matrix.constructor.matrix
> (build/cythonized/sage/matrix/constructor.c:2417)()
> 623 :class:`MatrixArgs`, see :trac:`24742`
> 624 """
> --> 625 return MatrixArgs(*args, **kwds).matrix()
> 626
> 627
>
> /ext/sage/sage-8.8_1804/local/lib/python2.7/site-packages/sage/matrix/args.pyx
>
> in sage.matrix.args.MatrixArgs.matrix
> (build/cythonized/sage/matrix/args.c:7765)()
> 656 break
> 657 else:
> --> 658 M = self.space(self, coerce=convert)
> 659
> 660 # Also store the matrix to support multiple calls of
> matrix()
>
> /ext/sage/sage-8.8_1804/local/lib/python2.7/site-packages/sage/matrix/matrix_space.pyc
>
> in __call__(self, entries, coerce, copy)
> 815 [t]
> 816 """
> --> 817 return self.element_class(self, entries, copy, coerce)
> 818
> 819 def change_ring(self, R):
>
> /ext/sage/sage-8.8_1804/local/lib/python2.7/site-packages/sage/matrix/matrix_gfpn_dense.pyx
>
> in sage.matrix.matrix_gfpn_dense.Matrix_gfpn_dense.__init__
> (build/cythonized/sage/matrix/matrix_gfpn_dense.c:5245)()
> 427 cdef long nc = ma.ncols
> 428
> --> 429 self.Data = MatAlloc(fl, nr, nc)
> 430 self._converter = FieldConverter(ma.base)
> 431
>
> RuntimeError: Cannot select field GF(25) in file matcore.c (line 130)
>
> This is on Ubuntu 18.04, on CoCalc.
Apparently this Sage installation uses MeatAxe as a backend for matrices
over finite non-prime fields. The file p025.zzz is supposed to be
automatically written to $DOT_SAGE/meataxe
So, I wonder: What is DOT_SAGE in your Sage environment? Is there
trouble with writing permissions? Or perhaps blank-space in the path
name?
For comparison (the value of DOT_SAGE can be obtained inside a Sage
shell or alternatively in a usual Sage session):
sage: DOT_SAGE
'/home/king/.sage/'
sage: !ls /home/king/.sage/meataxe
p002.zzz p005.zzz p013.zzz p025.zzz p064.zzz p125.zzz p243.zzz
p003.zzz p007.zzz p017.zzz p027.zzz p081.zzz p127.zzz
p004.zzz p009.zzz p019.zzz p049.zzz p121.zzz p169.zzz
Best regards,
Simon
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-support+unsubscr...@googlegroups.com.
To post to this group, send email to sage-support@googlegroups.com.
Visit this group at https://groups.google.com/group/sage-support.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sage-support/qg9l1e%241n6b%241%40blaine.gmane.org.
For more options, visit https://groups.google.com/d/optout.
