org.netlib.lapack
Class Slartg

java.lang.Object
  org.netlib.lapack.Slartg

public class Slartg
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
 *  =======
 *
 *  SLARTG generate a plane rotation so that
 *
 *     [  CS  SN  ]  .  [ F ]  =  [ R ]   where CS**2 + SN**2 = 1.
 *     [ -SN  CS  ]     [ G ]     [ 0 ]
 *
 *  This is a slower, more accurate version of the BLAS1 routine SROTG,
 *  with the following other differences:
 *     F and G are unchanged on return.
 *     If G=0, then CS=1 and SN=0.
 *     If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any
 *        floating point operations (saves work in SBDSQR when
 *        there are zeros on the diagonal).
 *
 *  If F exceeds G in magnitude, CS will be positive.
 *
 *  Arguments
 *  =========
 *
 *  F       (input) REAL
 *          The first component of vector to be rotated.
 *
 *  G       (input) REAL
 *          The second component of vector to be rotated.
 *
 *  CS      (output) REAL
 *          The cosine of the rotation.
 *
 *  SN      (output) REAL
 *          The sine of the rotation.
 *
 *  R       (output) REAL
 *          The nonzero component of the rotated vector.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Field Summary

static boolean	first
static float	safmin
static float	safmn2
static float	safmx2

Constructor Summary

Slartg()

Method Summary

static void

slartg(float f, float g, floatW cs, floatW sn, floatW r)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

safmin

public static float safmin

safmn2

public static float safmn2

safmx2

public static float safmx2

first

public static boolean first

Constructor Detail

Slartg

public Slartg()

Method Detail

slartg

public static void slartg(float f,
                          float g,
                          floatW cs,
                          floatW sn,
                          floatW r)