org.netlib.lapack
Class Dlartg

java.lang.Object
  extended by org.netlib.lapack.Dlartg

public class Dlartg
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 * ======= * * DLARTG 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 DROTG, * 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 DBDSQR when * there are zeros on the diagonal). * * If F exceeds G in magnitude, CS will be positive. * * Arguments * ========= * * F (input) DOUBLE PRECISION * The first component of vector to be rotated. * * G (input) DOUBLE PRECISION * The second component of vector to be rotated. * * CS (output) DOUBLE PRECISION * The cosine of the rotation. * * SN (output) DOUBLE PRECISION * The sine of the rotation. * * R (output) DOUBLE PRECISION * The nonzero component of the rotated vector. * * ===================================================================== * * .. Parameters ..


Field Summary
static boolean first
           
static double safmin
           
static double safmn2
           
static double safmx2
           
 
Constructor Summary
Dlartg()
           
 
Method Summary
static void dlartg(double f, double g, doubleW cs, doubleW sn, doubleW r)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

safmin

public static double safmin

safmn2

public static double safmn2

safmx2

public static double safmx2

first

public static boolean first
Constructor Detail

Dlartg

public Dlartg()
Method Detail

dlartg

public static void dlartg(double f,
                          double g,
                          doubleW cs,
                          doubleW sn,
                          doubleW r)