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From 704004634f6712645eb837cd86d7a09fa51ae36a Mon Sep 17 00:00:00 2001
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From: Milan Bouchet-Valat <nalimilan@club.fr>
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Date: Sat, 19 Mar 2016 17:21:15 +0100
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Subject: [PATCH] Fix non-deterministic tridiag test failure
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The signs or eigenvectors are random. Fixes #15565.
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---
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test/linalg/tridiag.jl | 16 ++++++++++++++--
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1 file changed, 14 insertions(+), 2 deletions(-)
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diff --git a/test/linalg/tridiag.jl b/test/linalg/tridiag.jl
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index 9441244..c43fd03 100644
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--- a/test/linalg/tridiag.jl
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+++ b/test/linalg/tridiag.jl
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@@ -313,13 +313,25 @@ let n = 12 #Size of matrix problem to test
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debug && println("stegr! call with index range")
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F = eigfact(SymTridiagonal(a, b),1:2)
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fF = eigfact(Symmetric(full(SymTridiagonal(a, b))),1:2)
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- @test_approx_eq F[:vectors] fF[:vectors]
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+ for i in 1:size(F[:vectors], 2)
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+ if sign(F[:vectors][1,i]) == sign(fF[:vectors][1,i])
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+ @test_approx_eq F[:vectors][:,i] fF[:vectors][:,i]
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+ else
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+ @test_approx_eq F[:vectors][:,i] -fF[:vectors][:,i]
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+ end
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+ end
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@test_approx_eq F[:values] fF[:values]
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debug && println("stegr! call with value range")
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F = eigfact(SymTridiagonal(a, b),0.0,1.0)
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fF = eigfact(Symmetric(full(SymTridiagonal(a, b))),0.0,1.0)
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- @test_approx_eq F[:vectors] fF[:vectors]
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+ for i in 1:size(F[:vectors], 2)
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+ if sign(F[:vectors][1,i]) == sign(fF[:vectors][1,i])
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+ @test_approx_eq F[:vectors][:,i] fF[:vectors][:,i]
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+ else
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+ @test_approx_eq F[:vectors][:,i] -fF[:vectors][:,i]
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+ end
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+ end
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@test_approx_eq F[:values] fF[:values]
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end
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--
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2.5.0
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