LAPACK
3.10.1
LAPACK: Linear Algebra PACKage

Functions  
subroutine  dgtsv (N, NRHS, DL, D, DU, B, LDB, INFO) 
DGTSV computes the solution to system of linear equations A * X = B for GT matrices More...  
subroutine  dgtsvx (FACT, TRANS, N, NRHS, DL, D, DU, DLF, DF, DUF, DU2, IPIV, B, LDB, X, LDX, RCOND, FERR, BERR, WORK, IWORK, INFO) 
DGTSVX computes the solution to system of linear equations A * X = B for GT matrices More...  
This is the group of double solve driver functions for GT matrices