#18979: avoid Maxima on creation of symbolic matrices
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Reporter: rws | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.9
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/avoid_maxima_on_creation_of_symbolic_matrices|
75e679c687019c9657188003306bbd08314919a5
Dependencies: | Stopgaps:
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Comment (by rws):
> Secondly, the operations `import XYZ` and `isinstance(x, my_type)` are
not at all negligeable. Though, in this case it is not very noticeable
since the cost is elsewhere. But with your strategy, you are potentially
slowing down everthing for a corner case speed up.
This is nonsense. Look at how many instance checks you have in
`Matrix_generic_dense.__init__`. Lots of special cases. I have no idea why
you would try to avoid this one here.
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Ticket URL: <http://trac.sagemath.org/ticket/18979#comment:10>
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