ZPBTRS - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEZPBTRS - solves a system of linear equations A*X = B with a Hermitian positive definite band matrix A using the Cholesky factorization A = U**H*U or A = L*L**H computed by ZPBTRF
SYNOPSISSUBROUTINE ZPBTRS(  UPLO, N, KD, NRHS, AB, LDAB, B, LDB, INFO )  CHARACTER UPLO  INTEGER INFO, KD, LDAB, LDB, N, NRHS  COMPLEX*16 AB( LDAB, * ), B( LDB, * )
PURPOSEZPBTRS solves a system of linear equations A*X = B with a Hermitian positive definite band matrix A using the Cholesky factorization A = U**H*U or A = L*L**H computed by ZPBTRF.
ARGUMENTSUPLO (input) CHARACTER*1  = 'U': Upper triangular factor stored in AB;
= 'L': Lower triangular factor stored in AB. N (input) INTEGER  The order of the matrix A. N >= 0. KD (input) INTEGER  The number of superdiagonals of the matrix A if UPLO = 'U', or the number of subdiagonals if UPLO = 'L'. KD >= 0. NRHS (input) INTEGER  The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0. AB (input) COMPLEX*16 array, dimension (LDAB,N)  The triangular factor U or L from the Cholesky factorization A = U**H*U or A = L*L**H of the band matrix A, stored in the first KD+1 rows of the array. The j-th column of U or L is stored in the j-th column of the array AB as follows: if UPLO ='U', AB(kd+1+i-j,j) = U(i,j) for max(1,j-kd)<=i<=j; if UPLO ='L', AB(1+i-j,j) = L(i,j) for j<=i<=min(n,j+kd). LDAB (input) INTEGER  The leading dimension of the array AB. LDAB >= KD+1. B (input/output) COMPLEX*16 array, dimension (LDB,NRHS)  On entry, the right hand side matrix B. On exit, the solution matrix X. LDB (input) INTEGER  The leading dimension of the array B. LDB >= max(1,N). INFO (output) INTEGER  = 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value 0
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