#18920: upgrade Maxima to 5.36.1
-------------------------------------+-------------------------------------
Reporter: dimpase | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: Not yet reported | Work issues:
upstream; Will do shortly. | Commit:
Branch: | 0d0649ad925808a308084b04253d7eb5c3fe2fad
u/dimpase/eclupdate | Stopgaps:
Dependencies: #18961 |
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Changes (by pbruin):
* upstream: N/A => Not yet reported upstream; Will do shortly.
Comment:
I tried upgrading to Maxima 5.37.0 (released 17 August). The formatting
problem is fixed, although some of the output still looks slightly
different (more/fewer parentheses, different ordering of terms in some
polynomials).
However, there is a serious bug in the function `eigenvectors` causing too
few eigenvectors to be returned:
{{{
(%i1) M: matrix([1, 1, 0], [0, 1, 0], [0, 0, 2]);
[ 1 1 0 ]
[ ]
(%o1) [ 0 1 0 ]
[ ]
[ 0 0 2 ]
}}}
Maxima 5.35.1 computes the eigenvalues and eigenvectors correctly:
{{{
(%i2) eigenvectors(M);
(%o2) [[[1, 2], [2, 1]], [[[1, 0, 0]], [[0, 0, 1]]]]
}}}
In Maxima 5.37.0, the eigenvector `[0, 0, 1]` is missing:
{{{
(%i2) eigenvectors(M);
(%o2) [[[1, 2], [2, 1]], [[[1, 0, 0]]]]
}}}
I found this out through several doctest failures in Sage.
--
Ticket URL: <http://trac.sagemath.org/ticket/18920#comment:40>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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