Opened 3 years ago
Last modified 10 months ago
#13556 new defect
vector(RR, QQ) stalls
Reported by: | eviatarbach | Owned by: | jason, was |
---|---|---|---|
Priority: | major | Milestone: | sage-6.4 |
Component: | linear algebra | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
The command vector(RR, QQ) never finishes executing.
Change History (6)
comment:1 Changed 3 years ago by fwclarke
comment:2 Changed 3 years ago by tscrim
To the best of my knowledge, sage currently does not handle infinite sequences. So the following also run indefinitely
sage: list(QQ) sage: tuple(QQ) sage: Sequence((1..)) sage: Sequence(ZZ) sage: Sequence(Partitons())
I've started a thread on sage-devel about how to proceed.
https://groups.google.com/forum/?fromgroups=#!topic/sage-devel/Pl14P2mr8N8
comment:3 Changed 22 months ago by jdemeyer
- Milestone changed from sage-5.11 to sage-5.12
comment:4 Changed 16 months ago by vbraun_spam
- Milestone changed from sage-6.1 to sage-6.2
comment:5 Changed 13 months ago by vbraun_spam
- Milestone changed from sage-6.2 to sage-6.3
comment:6 Changed 10 months ago by vbraun_spam
- Milestone changed from sage-6.3 to sage-6.4
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The reason this takes for ever is that Sage is trying to create the infinite vector
whose entries are an enumeration of the rationals. It's line 504 of sage/structure/sequence.py (sage-5.3):
in which universe is RR and x is QQ, that's hanging.
An initial segment of this vector can created as