org.netlib.blas
Class Drotmg

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

public class Drotmg
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
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 ..


Field Summary
static double gam
           
static double gamsq
           
static double one
           
static double rgamsq
           
static double two
           
static double zero
           
 
Constructor Summary
Drotmg()
           
 
Method Summary
static void drotmg(doubleW dd1, doubleW dd2, doubleW dx1, double dy1, double[] dparam, int _dparam_offset)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

zero

public static double zero

one

public static double one

two

public static double two

gam

public static double gam

gamsq

public static double gamsq

rgamsq

public static double rgamsq
Constructor Detail

Drotmg

public Drotmg()
Method Detail

drotmg

public static void drotmg(doubleW dd1,
                          doubleW dd2,
                          doubleW dx1,
                          double dy1,
                          double[] dparam,
                          int _dparam_offset)