SUBROUTINE CHBGST( VECT, UPLO, N, KA, KB, AB, LDAB, BB, LDBB, X, * LDX, WORK, RWORK, INFO) CHARACTER * 1 VECT, UPLO COMPLEX AB(LDAB,*), BB(LDBB,*), X(LDX,*), WORK(*) INTEGER N, KA, KB, LDAB, LDBB, LDX, INFO REAL RWORK(*) SUBROUTINE CHBGST_64( VECT, UPLO, N, KA, KB, AB, LDAB, BB, LDBB, X, * LDX, WORK, RWORK, INFO) CHARACTER * 1 VECT, UPLO COMPLEX AB(LDAB,*), BB(LDBB,*), X(LDX,*), WORK(*) INTEGER*8 N, KA, KB, LDAB, LDBB, LDX, INFO REAL RWORK(*)
SUBROUTINE HBGST( VECT, UPLO, [N], KA, KB, AB, [LDAB], BB, [LDBB], * X, [LDX], [WORK], [RWORK], [INFO]) CHARACTER(LEN=1) :: VECT, UPLO COMPLEX, DIMENSION(:) :: WORK COMPLEX, DIMENSION(:,:) :: AB, BB, X INTEGER :: N, KA, KB, LDAB, LDBB, LDX, INFO REAL, DIMENSION(:) :: RWORK SUBROUTINE HBGST_64( VECT, UPLO, [N], KA, KB, AB, [LDAB], BB, [LDBB], * X, [LDX], [WORK], [RWORK], [INFO]) CHARACTER(LEN=1) :: VECT, UPLO COMPLEX, DIMENSION(:) :: WORK COMPLEX, DIMENSION(:,:) :: AB, BB, X INTEGER(8) :: N, KA, KB, LDAB, LDBB, LDX, INFO REAL, DIMENSION(:) :: RWORK
void chbgst(char vect, char uplo, int n, int ka, int kb, complex *ab, int ldab, complex *bb, int ldbb, complex *x, int ldx, int *info);
void chbgst_64(char vect, char uplo, long n, long ka, long kb, complex *ab, long ldab, complex *bb, long ldbb, complex *x, long ldx, long *info);
B must have been previously factorized as S**H*S by CPBSTF, using a split Cholesky factorization. A is overwritten by C = X**H*A*X, where X = S**(-1)*Q and Q is a unitary matrix chosen to preserve the bandwidth of A.
On exit, the transformed matrix X**H*A*X, stored in the same format as A.