• NAME
• SYNOPSIS
• F95 INTERFACE
• C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

dger - perform the rank 1 operation A := alpha*x*y' + A

SYNOPSIS

  SUBROUTINE DGER( M, N, ALPHA, X, INCX, Y, INCY, A, LDA)
  INTEGER M, N, INCX, INCY, LDA
  DOUBLE PRECISION ALPHA
  DOUBLE PRECISION X(*), Y(*), A(LDA,*)

  SUBROUTINE DGER_64( M, N, ALPHA, X, INCX, Y, INCY, A, LDA)
  INTEGER*8 M, N, INCX, INCY, LDA
  DOUBLE PRECISION ALPHA
  DOUBLE PRECISION X(*), Y(*), A(LDA,*)

F95 INTERFACE

  SUBROUTINE GER( [M], [N], ALPHA, X, [INCX], Y, [INCY], A, [LDA])
  INTEGER :: M, N, INCX, INCY, LDA
  REAL(8) :: ALPHA
  REAL(8), DIMENSION(:) :: X, Y
  REAL(8), DIMENSION(:,:) :: A

  SUBROUTINE GER_64( [M], [N], ALPHA, X, [INCX], Y, [INCY], A, [LDA])
  INTEGER(8) :: M, N, INCX, INCY, LDA
  REAL(8) :: ALPHA
  REAL(8), DIMENSION(:) :: X, Y
  REAL(8), DIMENSION(:,:) :: A

C INTERFACE

#include <sunperf.h>

void dger(int m, int n, double alpha, double *x, int incx, double *y, int incy, double *a, int lda);

void dger_64(long m, long n, double alpha, double *x, long incx, double *y, long incy, double *a, long lda);

PURPOSE

dger performs the rank 1 operation A := alpha*x*y' + A, where alpha is a scalar, x is an m element vector, y is an n element vector and A is an m by n matrix.

ARGUMENTS

• M (input)
  On entry, M specifies the number of rows of the matrix A. M > = 0. Unchanged on exit.

• N (input)
  On entry, N specifies the number of columns of the matrix A. N > = 0. Unchanged on exit.

• ALPHA (input)
  On entry, ALPHA specifies the scalar alpha. Unchanged on exit.

• X (input)
  ( 1 + ( m - 1 )*abs( INCX ) ). Before entry, the incremented array X must contain the m element vector x. Unchanged on exit.

• INCX (input)
  On entry, INCX specifies the increment for the elements of X. INCX < > 0. Unchanged on exit.

• Y (input)
  ( 1 + ( n - 1 )*abs( INCY ) ). Before entry, the incremented array Y must contain the n element vector y. Unchanged on exit.

• INCY (input)
  On entry, INCY specifies the increment for the elements of Y. INCY < > 0. Unchanged on exit.

• A (input/output)
  Before entry, the leading m by n part of the array A must contain the matrix of coefficients. On exit, A is overwritten by the updated matrix.

• LDA (input)
  On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. LDA > = max( 1, m ). Unchanged on exit.