#6481 closed defect (duplicate)
g.subs({x:1,y:2}) should walk through x,y sorted
| Reported by: | malb | Owned by: | malb |
|---|---|---|---|
| Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
| Component: | commutative algebra | Keywords: | |
| Cc: | Merged in: | ||
| Authors: | Reviewers: | ||
| Report Upstream: | Work issues: | ||
| Branch: | Commit: | ||
| Dependencies: | Stopgaps: |
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Description
reported by Kwankyu on [sage-support]:
I mean the substitution y:x*y is applied first in the following
sage: R.<x,y>=QQ[]
sage: g=x+y
sage: g.subs({x:x+1,y:x*y})
x*y + x + y + 1
where I think applying x:x+1 first seems intuitive if order ever
should be significant.
Change History (4)
comment:1 Changed 12 years ago by
comment:2 Changed 12 years ago by
- Milestone changed from sage-4.1 to sage-4.1.1
comment:3 Changed 12 years ago by
- Resolution set to duplicate
- Status changed from new to closed
Dupe of #6482
comment:4 Changed 12 years ago by
- Milestone changed from sage-4.1.2 to sage-duplicate/invalid/wontfix
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For the record, I think the entire design of subs for multivariate polynomial rings is wrong. I've thus opened #6482 and explained my reasoning for this.
Note that in any case, if the current subs behavior is super fast or useful to people (is it?) then we can keep it as a nondefault option, in which case this ticket #6481 also makes sense to keep, since at least we should do the order of substitution in an easy-to-understand way.