This works on sage-8.5:
sage: a = var('a')
....: matrix(GF(25, a), [[1,0], [0, 1]])
....:
[1 0]
[0 1]
but not on sage-8.6 or later:
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.
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