#14681: dumps doesn't save immutability for Matrix_mod2_dense
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Reporter: matthew.weippert | Owner: jason, was
Type: defect | Status: new
Priority: minor | Milestone: sage-5.10
Component: linear algebra | Keywords: immutable hashable matrix
GF(2)
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Dumps doesn't save immutability for matrices over GF(2).
Simple example:
{{{
z = zero_matrix(GF(2), 3)
z.set_immutable()
print z.is_immutable()
zstr = z.dumps()
z2 = loads(zstr)
print z2.is_immutable()
}}}
This affects saving matrices and in particular raises
{{{TypeError('mutable matrices are unhashable',)}}} when these matrices
are used in hashed collections (set/dict etc):
{{{
z = zero_matrix(GF(2), 3)
z.set_immutable()
s = set()
s.add(z)
sstr = dumps(s)
s2 = loads(sstr)
}}}
'''Work Around for saving:'''
Saving lists of matrices works just fine, so if you need to save a set or
dictionary, convert to/from a list on before/after save.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14681>
Sage <http://www.sagemath.org>
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