#8071: Trivial kernel of a matrix over non-fields are broken
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Reporter: rbeezer | Owner: was
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-4.3.2
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Blockedby: | Reviewer:
Blocking: | Author: Rob Beezer
Merged: |
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Changes (by newvalueoldvalue):
* status: new => needs_review
* author: => Rob Beezer
Comment:
This patch adds a new helper function to compute the right kernel of a
matrix in the trivial cases of zero rows or zero columns. When the ring
is not a field or a PID, it is not always possible to create the submodule
needed as a return value. So in these cases it gives an informative error
message (which is the response to the bug).
This function has been called in four places, and various doctests have
been added. This is the first step in refactoring and cleaning up some of
the matrix code for kernels of matrices.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8071#comment:2>
Sage <http://www.sagemath.org>
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