On 2013-03-20, John Cremona <john.crem...@gmail.com> wrote:
> 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
does this work in terminal?
(for it looks like it's nb-related...)
>
>
> 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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