spbtrs
spbtrs - 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 SPBTRS( UPLO, N, NDIAG, NRHS, A, LDA, B, LDB, INFO)
CHARACTER * 1 UPLO
INTEGER N, NDIAG, NRHS, LDA, LDB, INFO
REAL A(LDA,*), B(LDB,*)
SUBROUTINE SPBTRS_64( UPLO, N, NDIAG, NRHS, A, LDA, B, LDB, INFO)
CHARACTER * 1 UPLO
INTEGER*8 N, NDIAG, NRHS, LDA, LDB, INFO
REAL 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, 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, DIMENSION(:,:) :: A, B
#include <sunperf.h>
void spbtrs(char uplo, int n, int ndiag, int nrhs, float *a, int lda, float *b, int ldb, int *info);
void spbtrs_64(char uplo, long n, long ndiag, long nrhs, float *a, long lda, float *b, long ldb, long *info);
spbtrs 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.
-
* UPLO (input)
-
-
* N (input)
-
The order of the matrix A. N >= 0.
-
* NDIAG (input)
-
The number of superdiagonals of the matrix A if UPLO = 'U',
or the number of subdiagonals if UPLO = 'L'. NDIAG >= 0.
-
* NRHS (input)
-
The number of right hand sides, i.e., the number of columns
of the matrix B. NRHS >= 0.
-
* A (input)
-
The triangular factor U or L from the Cholesky factorization
A = U**T*U or A = L*L**T of the band matrix A, stored in the
first NDIAG+1 rows of the array. The j-th column of U or L is
stored in the j-th column of the array A as follows:
if UPLO ='U', 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).
-
* LDA (input)
-
The leading dimension of the array A. LDA >= NDIAG+1.
-
* B (input/output)
-
On entry, the right hand side matrix B.
On exit, the solution matrix X.
-
* LDB (input)
-
The leading dimension of the array B. LDB >= max(1,N).
-
* INFO (output)
-