#4492: block_matrix reacts inconsistently with 0
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Reporter: jbmohler | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone:
Component: algebra | Keywords:
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Using ZZ(0) as an element of the list passed to block_matrix appears to be
a special case somehow and throws an exception rather than creating the
matrix seems reasonable to me.
{{{
sage: i=MatrixSpace(ZZ,2,2)(1)
sage: i
[1 0]
[0 1]
sage: block_matrix([1,i,1,1]) # this works as I expect
[1 0|1 0]
[0 1|0 1]
[---+---]
[1 0|1 0]
[0 1|0 1]
sage: block_matrix([0,i,1,1]) # this doesn't ... why is 0 special
...
ValueError: Insufficient information to determine dimensions.
}}}
This feels to me like a hazardous inconsistency.
Perhaps I should also add that I don't really like that it just blithely
assumes I want a square matrix (although I did in my actual usage).
Ticket #2429 addresses that issue more wholeheartedly.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4492>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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