dpbtrs - solve a system of linear equations A*X = B with a symmetric positive definite band matrix A using the Cholesky factorization A = U**T*U or A = L*L**T computed by SPBTRF
SUBROUTINE DPBTRS( UPLO, N, NDIAG, NRHS, A, LDA, B, LDB, INFO) CHARACTER * 1 UPLO INTEGER N, NDIAG, NRHS, LDA, LDB, INFO DOUBLE PRECISION A(LDA,*), B(LDB,*)
SUBROUTINE DPBTRS_64( UPLO, N, NDIAG, NRHS, A, LDA, B, LDB, INFO) CHARACTER * 1 UPLO INTEGER*8 N, NDIAG, NRHS, LDA, LDB, INFO DOUBLE PRECISION A(LDA,*), B(LDB,*)
SUBROUTINE PBTRS( UPLO, [N], NDIAG, [NRHS], A, [LDA], B, [LDB], * [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER :: N, NDIAG, NRHS, LDA, LDB, INFO REAL(8), DIMENSION(:,:) :: A, B
SUBROUTINE PBTRS_64( UPLO, [N], NDIAG, [NRHS], A, [LDA], B, [LDB], * [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, NDIAG, NRHS, LDA, LDB, INFO REAL(8), DIMENSION(:,:) :: A, B
#include <sunperf.h>
void dpbtrs(char uplo, int n, int ndiag, int nrhs, double *a, int lda, double *b, int ldb, int *info);
void dpbtrs_64(char uplo, long n, long ndiag, long nrhs, double *a, long lda, double *b, long ldb, long *info);
dpbtrs solves a system of linear equations A*X = B with a symmetric positive definite band matrix A using the Cholesky factorization A = U**T*U or A = L*L**T computed by SPBTRF.
= 'U': Upper triangular factor stored in A;
= 'L': Lower triangular factor stored in A.
A(kd+1+i-j,j)
= U(i,j)
for max(1,j-kd)
< =i < =j;
if UPLO ='L', A(1+i-j,j)
= L(i,j)
for j < =i < =min(n,j+kd).
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value