#15688: matrix*vector coercion
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Reporter: barbules | Owner:
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone: sage-6.1
Component: PLEASE CHANGE | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by barbules:
Old description:
> In sage 5.8 the multiplication matrix*vector does not give the correct
> answer when the vector has to be coerced.
>
> Example:
>
> F=GF(3571)
> m=matrix(F,[1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1])
> w=vector(QQ,[89843/2, 555841/2, 754633/2, 211553, 152186, 286953, 70867,
> 109089, 156622, 341523, 319195, 109233, 277852, 232951, 244697, 325034,
> 295611])
> print m*w,m*w.change_ring(F)
New description:
In sage 5.8 the multiplication matrix*vector does not give the correct
answer when the vector has to be coerced.
Example:
F=GF(3571);
m=matrix(F,[1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1]);
w=vector(QQ,[89843/2, 555841/2, 754633/2, 211553, 152186, 286953, 70867,
109089, 156622, 341523, 319195, 109233, 277852, 232951, 244697, 325034,
295611]);
print m*w,m*w.change_ring(F)
--
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Ticket URL: <http://trac.sagemath.org/ticket/15688#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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