org.netlib.lapack
Class SLARFG

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

public class SLARFG
extends java.lang.Object

SLARFG is a simplified interface to the JLAPACK routine slarfg.
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 * ======= * * SLARFG generates a real elementary reflector H of order n, such * that * * H * ( alpha ) = ( beta ), H' * H = I. * ( x ) ( 0 ) * * where alpha and beta are scalars, and x is an (n-1)-element real * vector. H is represented in the form * * H = I - tau * ( 1 ) * ( 1 v' ) , * ( v ) * * where tau is a real scalar and v is a real (n-1)-element * vector. * * If the elements of x are all zero, then tau = 0 and H is taken to be * the unit matrix. * * Otherwise 1 <= tau <= 2. * * Arguments * ========= * * N (input) INTEGER * The order of the elementary reflector. * * ALPHA (input/output) REAL * On entry, the value alpha. * On exit, it is overwritten with the value beta. * * X (input/output) REAL array, dimension * (1+(N-2)*abs(INCX)) * On entry, the vector x. * On exit, it is overwritten with the vector v. * * INCX (input) INTEGER * The increment between elements of X. INCX > 0. * * TAU (output) REAL * The value tau. * * ===================================================================== * * .. Parameters ..


Constructor Summary
SLARFG()
           
 
Method Summary
static void SLARFG(int n, floatW alpha, float[] x, int incx, floatW tau)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SLARFG

public SLARFG()
Method Detail

SLARFG

public static void SLARFG(int n,
                          floatW alpha,
                          float[] x,
                          int incx,
                          floatW tau)