#11848: zero_at() method for RDF/CDF vectors
------------------------------+---------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: enhancement | Status: positive_review
Priority: minor | Milestone: sage-4.7.2
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: Leif Leonhardy | Author: Rob Beezer
Merged: | Dependencies:
------------------------------+---------------------------------------------
Changes (by leif):
* status: needs_review => positive_review
Comment:
This function is (e.g.) required by a doctest fix for #7852:
{{{
#!diff
diff --git a/sage/misc/preparser.py b/sage/misc/preparser.py
--- a/sage/misc/preparser.py
+++ b/sage/misc/preparser.py
@@ -1383,11 +1383,15 @@
sage: A = matrix(RDF, 5, 5, 2)
sage: b = vector(RDF, 5, range(5))
- sage: A \ b
+ sage: # On at least one platform, we get a "negative zero":
+ sage: v = A \ b
+ sage: v.zero_at(1e-19)
(0.0, 0.5, 1.0, 1.5, 2.0)
- sage: A._backslash_(b)
+ sage: v = A._backslash_(b)
+ sage: v.zero_at(1e-19)
(0.0, 0.5, 1.0, 1.5, 2.0)
- sage: A * BackslashOperator() * b
+ sage: v = A * BackslashOperator() * b
+ sage: v.zero_at(1e-19)
(0.0, 0.5, 1.0, 1.5, 2.0)
"""
return self.left._backslash_(right)
}}}
With both patches applied, the tests now pass on the Skynet machine "cleo"
(Linux IA64 / Itanium 2), where they previously failed, so '''positive
review'''.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11848#comment:5>
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