#13611: block_matrix forgets subdivisions of submatrices
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Reporter: jsrn | Owner: jason, was
Type: defect | Status: new
Priority: minor | Milestone: sage-5.5
Component: linear algebra | Keywords: block_matrix
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Writing the following
{{{
m = matrix(ZZ,2,2, [1,2,3,4])
M=block_matrix([m,m],nrows=1)
block_matrix([M,M],ncols=1)
}}}
should return the same as
{{{
m = matrix(ZZ,2,2, [1,2,3,4])
block_matrix([m,m,m,m],nrows=2)
}}}
However, the former forgets the subdivided structure of M when
constructing the second block-matrix.
The above will not be possible in cases where the sub-sub-divisions do not
line up, but in cases where it is, there seems to be no reason to throw
away this information. In particular, it makes block_matrix much more
useful for iteratively constructing a large matrix while still retaining
the most detailed level of sub-divisions (since there is no notion of
multi-level sub-divisions).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13611>
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