#17350: Singular value nonsensical doctests fail on 32-bit
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by vbraun):
* component: PLEASE CHANGE => linear algebra
* type: PLEASE CHANGE => defect
Old description:
New description:
Why do we test a lower bound for the fourth and fifth singular value?
Predictably breaks on some platforms.
{{{
sage: A = matrix(CDF, [[46*I - 28, -47*I - 50, 21*I + 51,
-62*I - 782, 13*I + 22],
....: [35*I - 20, -32*I - 46, 18*I + 43,
-57*I - 670, 7*I + 3],
....: [22*I - 13, -23*I - 23, 9*I + 24, -26*I
- 347, 7*I + 13],
....: [-44*I + 23, 41*I + 57, -19*I - 54,
60*I + 757, -11*I - 9],
....: [30*I - 18, -30*I - 34, 14*I + 34,
-42*I - 522, 8*I + 12]])
sage: sv = A.singular_values()
sage: sv[0:3] # tol 1e-14
[1440.7336659952966, 18.404403413369227, 6.839707797136151]
sage: (10^-15 < sv[3] < 10^-13) or sv[3]
True
sage: (10^-16 < sv[4] < 10^-14) or sv[4]
True
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17350#comment:1>
Sage <http://www.sagemath.org>
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