In Sage-5.8, we have a matrix M of rationals:
type(M)
<type 'sage.matrix.matrix_rational_dense.Matrix_rational_dense'>
M.parent()
Full MatrixSpace of 138 by 179 dense matrices over Rational Field
but none of M.rank(), M.kernel() or even plain M work, all give the
error message
IndexError: string index out of range
The traceback is below. I have no idea why strongs or files are
involved at all. Any ideas?
verbose 1 (1: , <module>) computing left kernel for 138x179 matrix
verbose 1 (1: , <module>) computing a right kernel for 179x138 matrix
over Rational Field
verbose 1 (1: , <module>) computing right kernel matrix over the
rationals for 179x138 matrix
verbose 1 (1: , <module>) computing null space of 179 x 138 matrix using IML
verbose 1 (1: , <module>) finished computing null space (time = 0.284018)
verbose 1 (1: , <module>) done computing right kernel matrix over the
rationals for 179x138 matrix (time = 0.292018)
verbose 1 (1: , <module>) rational in-place Gauss elimination on 1 x 138 matrix
verbose 1 (1: , <module>) done with gauss echelon form (time = 0.008)
verbose 1 (1: , <module>) done computing a right kernel for 179x138
matrix over Rational Field (time = 0.304018)
verbose 1 (1: , <module>) done computing left kernel for 138x179
matrix (time = 0.32402)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_52.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding:
utf-8 -*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("TS5rZXJuZWwoKQ=="),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpjcmygY/___code___.py", line 2, in <module>
exec compile(u'M.kernel()
File "", line 1, in <module>
File "sage_object.pyx", line 154, in
sage.structure.sage_object.SageObject.__repr__
(sage/structure/sage_object.c:1769)
File
"/usr/local/sage/sage-5.7/local/lib/python2.7/site-packages/sage/modules/free_module.py",
line 6367, in _repr_
"Basis matrix:\n%s"%self.basis_matrix()
File "matrix0.pyx", line 1718, in
sage.matrix.matrix0.Matrix.__repr__ (sage/matrix/matrix0.c:9229)
File
"/usr/local/sage/sage-5.7/local/lib/python2.7/site-packages/sage/misc/sageinspect.py",
line 1917, in sage_getvariablename
for frame in inspect.stack():
File "/usr/local/sage/sage-5.7/local/lib/python/inspect.py", line
1054, in stack
return getouterframes(sys._getframe(1), context)
File "/usr/local/sage/sage-5.7/local/lib/python/inspect.py", line
1032, in getouterframes
framelist.append((frame,) + getframeinfo(frame, context))
File "/usr/local/sage/sage-5.7/local/lib/python/inspect.py", line
1007, in getframeinfo
lines, lnum = findsource(frame)
File "/usr/local/sage/sage-5.7/local/lib/python/inspect.py", line
528, in findsource
if not sourcefile and file[0] + file[-1] != '<>':
IndexError: string index out of range
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