LAPACK
3.8.0
LAPACK: Linear Algebra PACKage

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Functions/Subroutines  
subroutine  slarre (RANGE, N, VL, VU, IL, IU, D, E, E2, RTOL1, RTOL2, SPLTOL, NSPLIT, ISPLIT, M, W, WERR, WGAP, IBLOCK, INDEXW, GERS, PIVMIN, WORK, IWORK, INFO) 
SLARRE given the tridiagonal matrix T, sets small offdiagonal elements to zero and for each unreduced block Ti, finds base representations and eigenvalues. More...  