org.netlib.blas
Class DROTMG

java.lang.Object
  extended by org.netlib.blas.DROTMG

public class DROTMG
extends java.lang.Object

DROTMG is a simplified interface to the JLAPACK routine drotmg.
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 * ======= * * CONSTRUCT THE MODIFIED GIVENS TRANSFORMATION MATRIX H WHICH ZEROS * THE SECOND COMPONENT OF THE 2-VECTOR (DSQRT(DD1)*DX1,DSQRT(DD2)* * DY2)**T. * WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS.. * * DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0 * * (DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0) * H=( ) ( ) ( ) ( ) * (DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0). * LOCATIONS 2-4 OF DPARAM CONTAIN DH11, DH21, DH12, AND DH22 * RESPECTIVELY. (VALUES OF 1.D0, -1.D0, OR 0.D0 IMPLIED BY THE * VALUE OF DPARAM(1) ARE NOT STORED IN DPARAM.) * * THE VALUES OF GAMSQ AND RGAMSQ SET IN THE DATA STATEMENT MAY BE * INEXACT. THIS IS OK AS THEY ARE ONLY USED FOR TESTING THE SIZE * OF DD1 AND DD2. ALL ACTUAL SCALING OF DATA IS DONE USING GAM. * * * Arguments * ========= * * DD1 (input/output) DOUBLE PRECISION * * DD2 (input/output) DOUBLE PRECISION * * DX1 (input/output) DOUBLE PRECISION * * DY1 (input) DOUBLE PRECISION * * DPARAM (input/output) DOUBLE PRECISION array, dimension 5 * DPARAM(1)=DFLAG * DPARAM(2)=DH11 * DPARAM(3)=DH21 * DPARAM(4)=DH12 * DPARAM(5)=DH22 * * ===================================================================== * * .. Local Scalars ..


Constructor Summary
DROTMG()
           
 
Method Summary
static void DROTMG(doubleW dd1, doubleW dd2, doubleW dx1, double dy1, double[] dparam)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DROTMG

public DROTMG()
Method Detail

DROTMG

public static void DROTMG(doubleW dd1,
                          doubleW dd2,
                          doubleW dx1,
                          double dy1,
                          double[] dparam)