#12964: multiply matrix of matrices by a scalar: boom
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Reporter: jhpalmieri | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-5.1
Component: linear algebra | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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From [http://stackoverflow.com/questions/8691546/multiply-matrix-of-
matrices-by-a-scalar-in-sage stackoverflow]: Define `a` to be a matrix
whose entries are matrices, and multiply `a` by a scalar:
{{{
a = matrix([[matrix([[ 1, 2], [ 3, 4]]),
matrix([[ 5, 6], [ 7, 8]])],
[matrix([[ 9, 10], [11, 12]]),
matrix([[13, 14], [15, 16]])]])
3 * a
}}}
This results in the following error message:
{{{
TypeError: unsupported operand parent(s) for '*':
'Full MatrixSpace of 2 by 2 dense matrices over Integer Ring'
and
'Full MatrixSpace of 2 by 2 dense matrices over Integer Ring'
}}}
which is clearly nonsense. Multiplying `a` by, for example, `3 *
identity_matrix(2)` works, by the way.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12964>
Sage <http://www.sagemath.org>
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