org.netlib.lapack
Class Dlassq

java.lang.Object
  org.netlib.lapack.Dlassq

public class Dlassq
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
 *  =======
 *
 *  DLASSQ  returns the values  scl  and  smsq  such that
 *
 *     ( scl**2 )*smsq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,

 *
 *  where  x( i ) = X( 1 + ( i - 1 )*INCX ). The value of  sumsq  is
 *  assumed to be non-negative and  scl  returns the value
 *
 *     scl = max( scale, abs( x( i ) ) ).
 *
 *  scale and sumsq must be supplied in SCALE and SUMSQ and
 *  scl and smsq are overwritten on SCALE and SUMSQ respectively.
 *
 *  The routine makes only one pass through the vector x.
 *
 *  Arguments
 *  =========
 *
 *  N       (input) INTEGER
 *          The number of elements to be used from the vector X.
 *
 *  X       (input) DOUBLE PRECISION array, dimension (N)
 *          The vector for which a scaled sum of squares is computed.
 *             x( i )  = X( 1 + ( i - 1 )*INCX ), 1 <= i <= n.
 *
 *  INCX    (input) INTEGER
 *          The increment between successive values of the vector X.
 *          INCX > 0.
 *
 *  SCALE   (input/output) DOUBLE PRECISION
 *          On entry, the value  scale  in the equation above.
 *          On exit, SCALE is overwritten with  scl , the scaling factor

 *          for the sum of squares.
 *
 *  SUMSQ   (input/output) DOUBLE PRECISION
 *          On entry, the value  sumsq  in the equation above.
 *          On exit, SUMSQ is overwritten with  smsq , the basic sum of
 *          squares from which  scl  has been factored out.
 *
 * =====================================================================

 *
 *     .. Parameters ..

Constructor Summary

Dlassq()

Method Summary

static void

dlassq(int n, double[] x, int _x_offset, int incx, doubleW scale, doubleW sumsq)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dlassq

public Dlassq()

Method Detail

dlassq

public static void dlassq(int n,
                          double[] x,
                          int _x_offset,
                          int incx,
                          doubleW scale,
                          doubleW sumsq)