zherk - perform one of the Hermitian rank k operations C := alpha*A*conjg( A' ) + beta*C or C := alpha*conjg( A' )*A + beta*C
SUBROUTINE ZHERK( UPLO, TRANSA, N, K, ALPHA, A, LDA, BETA, C, LDC) CHARACTER * 1 UPLO, TRANSA DOUBLE COMPLEX A(LDA,*), C(LDC,*) INTEGER N, K, LDA, LDC DOUBLE PRECISION ALPHA, BETA
SUBROUTINE ZHERK_64( UPLO, TRANSA, N, K, ALPHA, A, LDA, BETA, C, * LDC) CHARACTER * 1 UPLO, TRANSA DOUBLE COMPLEX A(LDA,*), C(LDC,*) INTEGER*8 N, K, LDA, LDC DOUBLE PRECISION ALPHA, BETA
SUBROUTINE HERK( UPLO, [TRANSA], [N], [K], ALPHA, A, [LDA], BETA, C, * [LDC]) CHARACTER(LEN=1) :: UPLO, TRANSA COMPLEX(8), DIMENSION(:,:) :: A, C INTEGER :: N, K, LDA, LDC REAL(8) :: ALPHA, BETA
SUBROUTINE HERK_64( UPLO, [TRANSA], [N], [K], ALPHA, A, [LDA], BETA, * C, [LDC]) CHARACTER(LEN=1) :: UPLO, TRANSA COMPLEX(8), DIMENSION(:,:) :: A, C INTEGER(8) :: N, K, LDA, LDC REAL(8) :: ALPHA, BETA
#include <sunperf.h>
void zherk(char uplo, char transa, int n, int k, double alpha, doublecomplex *a, int lda, double beta, doublecomplex *c, int ldc);
void zherk_64(char uplo, char transa, long n, long k, double alpha, doublecomplex *a, long lda, double beta, doublecomplex *c, long ldc);
zherk performs one of the Hermitian rank k operations C := alpha*A*conjg( A' ) + beta*C or C := alpha*conjg( A' )*A + beta*C where alpha and beta are real scalars, C is an n by n Hermitian matrix and A is an n by k matrix in the first case and a k by n matrix in the second case.
UPLO = 'U' or 'u' Only the upper triangular part of C is to be referenced.
UPLO = 'L' or 'l' Only the lower triangular part of C is to be referenced.
Unchanged on exit.
TRANSA = 'N' or 'n' C : = alpha*A*conjg( A' ) + beta*C.
TRANSA = 'C' or 'c' C : = alpha*conjg( A' )*A + beta*C.
Unchanged on exit.
Before entry with UPLO = 'L' or 'l', the leading n by n lower triangular part of the array C must contain the lower triangular part of the Hermitian matrix and the strictly upper triangular part of C is not referenced. On exit, the lower triangular part of the array C is overwritten by the lower triangular part of the updated matrix.
Note that the imaginary parts of the diagonal elements need not be set, they are assumed to be zero, and on exit they are set to zero.