#2607: find_minimum_on_interval() uses the wrong scipy function
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Reporter: AlexGhitza | Owner: jwmerrill
Type: defect | Status:
positive_review
Priority: major | Milestone: sage-5.1
Component: calculus | Resolution:
Keywords: sd31, sd40.5 | Work issues:
Report Upstream: N/A | Reviewers: Karl-Dieter
Crisman, Mike Hansen
Authors: Dan Drake, Andrey Novoseltsev | Merged in:
Dependencies: sage-5.1.beta2 | Stopgaps:
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Comment (by jdemeyer):
More importantly, this fails on OS X 10.4 ppc with numerical noise:
{{{
sage -t --long -force_lib devel/sage/sage/numerical/optimize.py
**********************************************************************
File
"/Users/buildbot/build/sage/moufang-1/moufang_full/build/sage-5.1.beta5/devel
/sage-main/sage/numerical/optimize.py", line 135:
sage: find_local_maximum(fast_float(8*e^(-x)*sin(x) - 1, x), 0, 8)
Expected:
(1.5791755355586754, 0.78539817769603...)
Got:
(1.5791755355586754, 0.7853981777050254)
GLPK Simplex Optimizer, v4.44
6 rows, 3 columns, 8 non-zeros
Preprocessing...
2 rows, 2 columns, 4 non-zeros
Scaling...
A: min|aij| = 2.400e+01 max|aij| = 5.000e+01 ratio = 2.083e+00
GM: min|aij| = 8.128e-01 max|aij| = 1.230e+00 ratio = 1.514e+00
EQ: min|aij| = 6.606e-01 max|aij| = 1.000e+00 ratio = 1.514e+00
Constructing initial basis...
Size of triangular part = 2
* 0: obj = -5.100000000e+01 infeas = 0.000e+00 (0)
* 1: obj = -5.225000000e+01 infeas = 0.000e+00 (0)
OPTIMAL SOLUTION FOUND
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2607#comment:56>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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