#12887: Optional args in Matrix_Mod submatrix method
------------------------------+---------------------------------------------
Reporter: dscharles | Owner: jason, was
Type: defect | Status: new
Priority: minor | Milestone: sage-5.1
Component: linear algebra | Keywords: matrix, finite field,
submatrix
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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When computing the smith form of a matrix (over a finite field) it promts
an error
{{{
#!python
sage: AA = matrix(Zmod(2), [[1,1],[1,0],[0,1]])
sage: AA.smith_form()
}}}
It promts
{{{
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_100.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("QUEuc21pdGhfZm9ybSgp"),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpXWhShB/___code___.py", line 2, in <module>
exec compile(u'AA.smith_form()
File "", line 1, in <module>
File "matrix2.pyx", line 10512, in sage.matrix.matrix2.Matrix.smith_form
(sage/matrix/matrix2.c:49285)
File "matrix_mod2_dense.pyx", line 1666, in
sage.matrix.matrix_mod2_dense.Matrix_mod2_dense.submatrix
(sage/matrix/matrix_mod2_dense.c:9696)
TypeError: submatrix() takes exactly 4 positional arguments (2 given)
}}}
It seems like the "Matrix_mod" submatrix method doesn't have "ncols" and
"nrows" as optional parameters (like the base Matrix class).
I used Sage 4.8.0 in an Ubuntu 12.04 (32 bits).
sage-support discussion:
[https://groups.google.com/forum/?fromgroups#!topic/sage-
support/TssHVf3oUeM]
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12887>
Sage <http://www.sagemath.org>
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