PDPTTRSV(3) ScaLAPACK routine of NEC Numeric Library Collection PDPTTRSV(3) NAME PDPTTRSV - solve a tridiagonal triangular system of linear equations A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS) SYNOPSIS SUBROUTINE PDPTTRSV( UPLO, N, NRHS, D, E, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO ) CHARACTER UPLO INTEGER IB, INFO, JA, LAF, LWORK, N, NRHS INTEGER DESCA( * ), DESCB( * ) DOUBLE PRECISION AF( * ), B( * ), D( * ), E( * ), WORK( * ) PURPOSE PDPTTRSV solves a tridiagonal triangular system of linear equations A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS) or A(1:N, JA:JA+N-1)^T * X = B(IB:IB+N-1, 1:NRHS) where A(1:N, JA:JA+N-1) is a tridiagonal triangular matrix factor produced by the Cholesky factorization code PDPTTRF and is stored in A(1:N,JA:JA+N-1) and AF. The matrix stored in A(1:N, JA:JA+N-1) is either upper or lower triangular according to UPLO, and the choice of solving A(1:N, JA:JA+N-1) or A(1:N, JA:JA+N-1)^T is dictated by the user by the parameter TRANS. Routine PDPTTRF MUST be called first. ScaLAPACK routine 31 October 2017 PDPTTRSV(3)