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eigvals: vh not defined error on SymTridiagonal matrices #2606

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Description

eigvals() throws a vh not defined error when using it to compute eigenvalues of a SymTridiagonal matrix. For example:

e=randn(5);
f=randn(4);
M=SymTridiagonal(e,f)
eigvals(M)
ERROR: in eigvals: vh not defined
 in eigvals at linalg/tridiag.jl:50
 in eigvals at linalg/tridiag.jl:51

eig(M) works just fine, as does eigvals(M) for a dense matrix M.

Reported on latest HEAD version (be3835e), OSX 10.8.3

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