All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class org.netlib.blas.DGER

java.lang.Object
   |
   +----org.netlib.blas.DGER

public class DGER

extends Object

DGER is a simplified interface to the JLAPACK routine dger.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

 *     ..
 *
 *  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.
 *
 *  Parameters
 *  ==========
 *
 *  M      - INTEGER.
 *           On entry, M specifies the number of rows of the matrix A.
 *           M must be at least zero.
 *           Unchanged on exit.
 *
 *  N      - INTEGER.
 *           On entry, N specifies the number of columns of the matrix A.
 *           N must be at least zero.
 *           Unchanged on exit.
 *
 *  ALPHA  - DOUBLE PRECISION.
 *           On entry, ALPHA specifies the scalar alpha.
 *           Unchanged on exit.
 *
 *  X      - DOUBLE PRECISION array of dimension at least
 *           ( 1 + ( m - 1 )*abs( INCX ) ).
 *           Before entry, the incremented array X must contain the m
 *           element vector x.
 *           Unchanged on exit.
 *
 *  INCX   - INTEGER.
 *           On entry, INCX specifies the increment for the elements of
 *           X. INCX must not be zero.
 *           Unchanged on exit.
 *
 *  Y      - DOUBLE PRECISION array of dimension at least
 *           ( 1 + ( n - 1 )*abs( INCY ) ).
 *           Before entry, the incremented array Y must contain the n
 *           element vector y.
 *           Unchanged on exit.
 *
 *  INCY   - INTEGER.
 *           On entry, INCY specifies the increment for the elements of
 *           Y. INCY must not be zero.
 *           Unchanged on exit.
 *
 *  A      - DOUBLE PRECISION array of DIMENSION ( LDA, n ).
 *           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    - INTEGER.
 *           On entry, LDA specifies the first dimension of A as declared
 *           in the calling (sub) program. LDA must be at least
 *           max( 1, m ).
 *           Unchanged on exit.
 *
 *
 *  Level 2 Blas routine.
 *
 *  -- Written on 22-October-1986.
 *     Jack Dongarra, Argonne National Lab.
 *     Jeremy Du Croz, Nag Central Office.
 *     Sven Hammarling, Nag Central Office.
 *     Richard Hanson, Sandia National Labs.
 *
 *
 *     .. Parameters ..

DGER()

DGER(int, int, double, double[], int, double[], int, double[][])

 public DGER()

 public static void DGER(int m,
                         int n,
                         double alpha,
                         double x[],
                         int incx,
                         double y[],
                         int incy,
                         double a[][])

All Packages  Class Hierarchy  This Package  Previous  Next  Index