Hi, I was kindly asked to report the following:
*** bug in ZM_lll, please report
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_65.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding:
utf-8 -*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("ZGVlcHNlYXJjaDIoNSwzMCw1LDMwLCJvdWQiKQ=="),globals())
+"\\n"); execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpHdJkgh/___code___.py", line 3, in <module>
exec
compile(u'deepsearch2(_sage_const_5 ,_sage_const_30 ,_sage_const_5
,_sage_const_30 ,"oud")
File "", line 1, in <module>
File "/tmp/tmpcN9xNe/___code___.py", line 33, in deepsearch2
nulkern=matrix(xplusy_macht+_sage_const_2 ,xplusy_macht,[[pq**i
for i in xrange(xplusy_macht)] for pq in
breuken]).integer_kernel().basis_matrix()
File "matrix2.pyx", line 3598, in
sage.matrix.matrix2.Matrix.integer_kernel (sage/matrix/matrix2.c:
16843)
File "matrix2.pyx", line 3449, in
sage.matrix.matrix2.Matrix.left_kernel (sage/matrix/matrix2.c:16326)
File "matrix2.pyx", line 3292, in
sage.matrix.matrix2.Matrix.right_kernel (sage/matrix/matrix2.c:15924)
File "matrix2.pyx", line 2911, in
sage.matrix.matrix2.Matrix.right_kernel_matrix (sage/matrix/matrix2.c:
14982)
File "matrix_integer_dense.pyx", line 2330, in
sage.matrix.matrix_integer_dense.Matrix_integer_dense._right_kernel_matrix
(sage/matrix/matrix_integer_dense.c:18184)
File "gen.pyx", line 7987, in sage.libs.pari.gen.gen.matkerint (sage/
libs/pari/gen.c:36310)
RuntimeError: Aborted
---
Explanation. I have a row of 7 rationals pq (in QQ), and I construct
aan VanDerMonde matrix (en.wikipedia.org/wiki/Vandermonde_matrix). The
row always contains [0,-1].
nulkern=matrix(xplusy_macht+_sage_const_2 ,xplusy_macht,[[pq**i for i
in xrange(xplusy_macht)] for pq in
breuken]).integer_kernel().basis_matrix()
I try to find the integer_kernel of the 7 by 5 matrix. Related is the
question on ASKSAGE ask.sagemath.org/question/941/is-there-a-routine-
to-find-a-integer-base
This is sufficient? I can rerun the calculations to find the hot spot,
but that will take a few days.
Roland
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