- SUBROUTINE PCPBTRS(
- UPLO, N, BW, NRHS, A, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )
- CHARACTER UPLO
- INTEGER BW, IB, INFO, JA, LAF, LWORK, N, NRHS
- INTEGER DESCA( * ), DESCB( * )
- COMPLEX A( * ), AF( * ), B( * ), WORK( * )
PURPOSEPCPBTRS solves a system of linear equations
where A(1:N, JA:JA+N-1) is the matrix used to produce the factors
stored in A(1:N,JA:JA+N-1) and AF by PCPBTRF.
A(1:N, JA:JA+N-1) is an N-by-N complex
banded symmetric positive definite distributed
matrix with bandwidth BW.
Depending on the value of UPLO, A stores either U or L in the equn A(1:N, JA:JA+N-1) = U'*U or L*L' as computed by PCPBTRF.
Routine PCPBTRF MUST be called first.