#4492: block_matrix reacts inconsistently with 0
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Reporter: jbmohler | Owner: was
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.3.2
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by wjp):
* status: needs_review => needs_work
Comment:
This breaks the following example:
sage: B = Matrix(ZZ,3,2,[1,2,3,4,5,6])
sage: block_matrix([0,1,B,1])
The problem is that it turns the 0 at the top into a 2x2 zero matrix while
it should be a 3x2 zero matrix, but that can only be deduced after
processing the ones further on.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4492#comment:9>
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