LAPACK 3.12.0
LAPACK: Linear Algebra PACKage

Functions  
subroutine  dlagts (job, n, a, b, c, d, in, y, tol, info) 
DLAGTS 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.  
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.  