Differences between revisions 7 and 8

Sage 3.2.3 Release Tour

Sage 3.2.3 was released on FIXME. For the official, comprehensive release notes, see sage-3.2.3.txt.

Algebra

Powers of polynomial variables (Alex Ghitza) -- Report an error message when a determinate of a (multivariate) polynomial is raised to a fractional exponent. Previously, raising a polynomial determinate to a fractional power has the effect of rounding the exponent to an integer. As yet, fractional powers are not supported.
Extensions of finite fields (Alex Ghitza) -- Implements methods random_element() and order() for quotients of polynomial rings. The method order() returns the number of elements of a quotient ring, and random_element() returns a random element of a quotient ring.
Conjugates for integer, rational and real numbers (Alex Ghitza) -- Implements trivial conjugate() methods for elements over the integers, rationals, and reals. Conjugates work (trivially) for matrices over rings that embed canonically into the real numbers.
Square roots of Galois field elements (John Cremona, William Stein) -- Improve the square root of an element of a Galois field GF(2^e), where e > 15. Previously, this works fine except for the square root of 1, where 1 is an element of GF(2^e) for e > 15.

Upgrade ATLAS in Sage to version 3.8.2 (Michael Abshoff) -- An update of the ATLAS spkg to the upstream version 3.8.2. This upstream version now provides: (1) better detection of Pentium D and E; (2) detect more Core2Duos cores; and (3) properly detect Dunnington cores. Versions 3.8.x for x < 2 sometimes detect a modern CPU architecture as an older architecture, hence causing a massive blow up in the time it takes to compile ATLAS on systems like Xeon core 2 quad, Itanium 2, and Xeon E5420.
Update optional Sage package polymake (Michael Abshoff) -- The updated optional Sage package is polymake-2.2.p5. Earlier versions hard coded spkg versions of cddlib and gmp, and could cause polymake to break in Sage versions 3.0.3 and 3.0.4.

Fix performance regression in eisenstein_submodule.py (Robert Bradshaw) -- Performance regression in eisenstein_submodule.py was due to cyclotomic coercion. Previously, it would take about 73.3 seconds to run all doctests in eisenstein_submodule.py. Now, the performance is substantially increased such that all dotests in eisenstein_submodule.py should now take about 3.4 seconds.

Some fixes to matrix_plot() and the plotting of gamma(x) (Mike Hansen, Robert Bradshaw).
Fix fallout in refactoring the plotting module (William Stein, Mike Hansen) -- Sage 3.2.1 refactored plot.py so that it was splitted up into multiple modules. However, the functions xmin/xmax/ymin/ymax were all removed without deprecating them. These are now added back exactly as before, since they are depended upon by a lot of plotting code.

-  ⇤ ← Revision 7 as of 2009-01-05 16:01:51 → 
  Size: 3273
  Editor: MartinAlbrecht
  Comment:
+   ← Revision 8 as of 2009-01-05 20:52:39 → ⇥
  Size: 3274
  Editor: Minh Nguyen
  Comment:
-Deletions are marked like this.
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- * Powers of polynomial variables (Alex Ghitza) -- Report an error message when a determinate of a (multivariate) polynomial is raised to a fractional exponent. Previously, raising a polynomial determinate to a fractional power has the effect of rounding the exponent to an integer. As yet, fractional powers is not supported.
+ * Powers of polynomial variables (Alex Ghitza) -- Report an error message when a determinate of a (multivariate) polynomial is raised to a fractional exponent. Previously, raising a polynomial determinate to a fractional power has the effect of rounding the exponent to an integer. As yet, fractional powers are not supported.