

SUBROUTINE PSPTTRSV(  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( * )  
REAL AF( * ), B( * ), D( * ), E( * ), WORK( * )  
PSPTTRSV solves a tridiagonal triangular system of linear equations A(1:N, JA:JA+N1) * X = B(IB:IB+N1, 1:NRHS) or
A(1:N, JA:JA+N1)^T * X = B(IB:IB+N1, 1:NRHS)where A(1:N, JA:JA+N1) is a tridiagonal
triangular matrix factor produced by the
Cholesky factorization code PSPTTRF
and is stored in A(1:N,JA:JA+N1) and AF.
The matrix stored in A(1:N, JA:JA+N1) is either
upper or lower triangular according to UPLO,
and the choice of solving A(1:N, JA:JA+N1) or A(1:N, JA:JA+N1)^T is dictated by the user by the parameter TRANS.Routine PSPTTRF MUST be called first.
ScaLAPACK version 1.7  PSPTTRSV (l)  13 August 2001 
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