#7581: use prCopyR to coerce multivariate polynomials in the simple case
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Reporter: malb | Owner: malb
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.3
Component: commutative algebra | Keywords:
Work_issues: | Author: Martin Albrecht
Upstream: N/A | Reviewer:
Merged: |
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Changes (by newvalueoldvalue):
* cc: SimonKing (added)
* status: new => needs_work
* author: => Martin Albrecht
Comment:
The attached patch makes things slightly faster.
'''Before'''
{{{
sage: R1 = PolynomialRing(QQ,'x',10001,order='lex')
sage: R2 = PolynomialRing(QQ,'x',10002,order='deglex')
sage: x10000 = R1('x10000')
sage: %time a = R2(x10000)
CPU times: user 5.77 s, sys: 0.18 s, total: 5.95 s
Wall time: 7.54 s
sage: %time a = R2(x10000)
CPU times: user 5.43 s, sys: 0.00 s, total: 5.43 s
Wall time: 5.59 s
sage: x10001 = R2('x10001')
sage: %time x10000 + x10001
CPU times: user 16.87 s, sys: 0.00 s, total: 16.87 s
Wall time: 17.05 s
x10000 + x10001
sage: %time x10000 + x10001
CPU times: user 5.43 s, sys: 0.00 s, total: 5.43 s
Wall time: 5.49 s
x10000 + x10001
}}}
'''After'''
{{{
sage: R1 = PolynomialRing(QQ,'x',10001,order='lex')
sage: R2 = PolynomialRing(QQ,'x',10002,order='deglex')
sage: x10000 = R1('x10000')
sage: %time a = R2(x10000)
CPU times: user 1.18 s, sys: 0.16 s, total: 1.34 s
Wall time: 1.36 s
sage: %time a = R2(x10000)
CPU times: user 0.87 s, sys: 0.00 s, total: 0.87 s
Wall time: 0.92 s
sage: x10001 = R2('x10001')
sage: %time x10000 + x10001
CPU times: user 7.67 s, sys: 0.00 s, total: 7.67 s
Wall time: 7.77 s
x10000 + x10001
sage: %time x10000 + x10001
CPU times: user 0.86 s, sys: 0.00 s, total: 0.87 s
Wall time: 0.91 s
x10000 + x10001
}}}
I haven't run doctests yet.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7581#comment:1>
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