#13304: Very inefficient scalar multiplication on FreeModule_ambient with
somewhat
large rank
-------------------------------------+-------------------------------------
Reporter: daniels | Owner: daniels
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Daniel Smertnig, | Reviewers: Vincent Delecroix
Marc Mezzarobba | Work issues:
Report Upstream: N/A | Commit:
Branch: | 8f09d5198e060add5dea75ed240739f6485ba8ce
public/ticket/13304 | Stopgaps:
Dependencies: |
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Changes (by vdelecroix):
* status: needs_review => needs_work
* reviewer: => Vincent Delecroix
Comment:
Hello,
You got it right for integer vectors but the generic constructor of
`FreeModuleElement_generic_dense` does call the basis in a very stupid way
{{{
coefficient_ring = parent.basis()[0][0].parent()
}}}
In particular the following also takes life time for the very same reason
{{{
sage: V = ZZ['x']^50000
sage: V([0]*50000)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/13304#comment:17>
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