dsyr2 - perform the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A
SUBROUTINE DSYR2( UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER * 1 UPLO INTEGER N, INCX, INCY, LDA DOUBLE PRECISION ALPHA DOUBLE PRECISION X(*), Y(*), A(LDA,*)
SUBROUTINE DSYR2_64( UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER * 1 UPLO INTEGER*8 N, INCX, INCY, LDA DOUBLE PRECISION ALPHA DOUBLE PRECISION X(*), Y(*), A(LDA,*)
SUBROUTINE SYR2( UPLO, [N], ALPHA, X, [INCX], Y, [INCY], A, [LDA]) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INCX, INCY, LDA REAL(8) :: ALPHA REAL(8), DIMENSION(:) :: X, Y REAL(8), DIMENSION(:,:) :: A
SUBROUTINE SYR2_64( UPLO, [N], ALPHA, X, [INCX], Y, [INCY], A, [LDA]) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INCX, INCY, LDA REAL(8) :: ALPHA REAL(8), DIMENSION(:) :: X, Y REAL(8), DIMENSION(:,:) :: A
#include <sunperf.h>
void dsyr2(char uplo, int n, double alpha, double *x, int incx, double *y, int incy, double *a, int lda);
void dsyr2_64(char uplo, long n, double alpha, double *x, long incx, double *y, long incy, double *a, long lda);
dsyr2 performs the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A, where alpha is a scalar, x and y are n element vectors and A is an n by n symmetric matrix.
UPLO = 'U' or 'u' Only the upper triangular part of A is to be referenced.
UPLO = 'L' or 'l' Only the lower triangular part of A is to be referenced.
Unchanged on exit.