Hi Simon,
isn't MeatAxe interfaced via a library, rather than via files?!
Doing arithmetics on small matrices storing them on a disk is insanely
inefficient...
Dima
On Fri, Jul 12, 2019 at 11:48 AM Simon King <simon.k...@uni-jena.de> wrote:
>
> 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.
--
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/CAAWYfq3Z68ho1WmeW-DHHDHkZGHmc79mDqjOjS1K%3DW6uo1szSQ%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
