#14535: Mutability of Graphs
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Reporter: SimonKing | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: graph theory | Resolution:
Keywords: mutability graph | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #14524 | Stopgaps:
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Comment (by SimonKing):
Replying to [comment:18 Stefan]:
> Again, Matrices have (in my opinion) a decent balance:
>
> {{{
> sage: A = matrix([[1,2],[3,4]])
> sage: A.set_immutable()
> sage: A[1,1] = 4
> Traceback (most recent call last):
> ...
> ValueError: matrix is immutable; please change a copy instead (i.e., use
copy(M) to change a copy of M).
> sage: B = copy(A)
> sage: B[1,1] = 1
> }}}
Actually I have not been aware that there is no `A.set_mutable`. So, thank
you for the pointer!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14535#comment:19>
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