LAPACK 3.12.0
LAPACK: Linear Algebra PACKage

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Functions/Subroutines  
subroutine  slagts (job, n, a, b, c, d, in, y, tol, info) 
SLAGTS solves the system of equations (TλI)x = y or (TλI)^Tx = y, where T is a general tridiagonal matrix and λ a scalar, using the LU factorization computed by slagtf.  