Hi all:
I found a bug related to matrices over polynomial rings.
Alex
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| Sage Version 4.6, Release Date: 2010-10-30 |
| Type notebook() for the GUI, and license() for information. |
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sage: R.<x,y>= PolynomialRing(QQ)
sage: f= x
sage: M= matrix([[f,0,0],[f,0,0]])
sage: M.parent()
Full MatrixSpace of 2 by 3 dense matrices over Multivariate Polynomial
Ring in x, y over Rational Field
sage: M.rank()
[x 0 0]
[x 0 0]
2
{(1, 0): x, (0, 0): x}
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call
last)
/Users/raichev/<ipython console> in <module>()
/Applications/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix0.so in sage.matrix.matrix0.Matrix.rank (sage/matrix/matrix0.c:
16674)()
/Applications/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix0.so in sage.matrix.matrix0.Matrix.pivots (sage/matrix/matrix0.c:
16549)()
RuntimeError: BUG: matrix pivots should have been set but weren't,
matrix parent = 'Full MatrixSpace of 2 by 3 dense matrices over
Multivariate Polynomial Ring in x, y over Rational Field'
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