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[bytom/vapor.git] / vendor / gonum.org / v1 / gonum / lapack / internal / testdata / dsterftest / dlassq.f

diff --git a/vendor/gonum.org/v1/gonum/lapack/internal/testdata/dsterftest/dlassq.f b/vendor/gonum.org/v1/gonum/lapack/internal/testdata/dsterftest/dlassq.f
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-*> \brief \b DLASSQ updates a sum of squares represented in scaled form.
-*
-*  =========== DOCUMENTATION ===========
-*
-* Online html documentation available at 
-*            http://www.netlib.org/lapack/explore-html/ 
-*
-*> \htmlonly
-*> Download DLASSQ + dependencies 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlassq.f"> 
-*> [TGZ]</a> 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlassq.f"> 
-*> [ZIP]</a> 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlassq.f"> 
-*> [TXT]</a>
-*> \endhtmlonly 
-*
-*  Definition:
-*  ===========
-*
-*       SUBROUTINE DLASSQ( N, X, INCX, SCALE, SUMSQ )
-* 
-*       .. Scalar Arguments ..
-*       INTEGER            INCX, N
-*       DOUBLE PRECISION   SCALE, SUMSQ
-*       ..
-*       .. Array Arguments ..
-*       DOUBLE PRECISION   X( * )
-*       ..
-*  
-*
-*> \par Purpose:
-*  =============
-*>
-*> \verbatim
-*>
-*> 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.
-*> \endverbatim
-*
-*  Arguments:
-*  ==========
-*
-*> \param[in] N
-*> \verbatim
-*>          N is INTEGER
-*>          The number of elements to be used from the vector X.
-*> \endverbatim
-*>
-*> \param[in] X
-*> \verbatim
-*>          X is 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.
-*> \endverbatim
-*>
-*> \param[in] INCX
-*> \verbatim
-*>          INCX is INTEGER
-*>          The increment between successive values of the vector X.
-*>          INCX > 0.
-*> \endverbatim
-*>
-*> \param[in,out] SCALE
-*> \verbatim
-*>          SCALE is 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.
-*> \endverbatim
-*>
-*> \param[in,out] SUMSQ
-*> \verbatim
-*>          SUMSQ is 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.
-*> \endverbatim
-*
-*  Authors:
-*  ========
-*
-*> \author Univ. of Tennessee 
-*> \author Univ. of California Berkeley 
-*> \author Univ. of Colorado Denver 
-*> \author NAG Ltd. 
-*
-*> \date September 2012
-*
-*> \ingroup auxOTHERauxiliary
-*
-*  =====================================================================
-      SUBROUTINE DLASSQ( N, X, INCX, SCALE, SUMSQ )
-*
-*  -- LAPACK auxiliary routine (version 3.4.2) --
-*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
-*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-*     September 2012
-*
-*     .. Scalar Arguments ..
-      INTEGER            INCX, N
-      DOUBLE PRECISION   SCALE, SUMSQ
-*     ..
-*     .. Array Arguments ..
-      DOUBLE PRECISION   X( * )
-*     ..
-*
-* =====================================================================
-*
-*     .. Parameters ..
-      DOUBLE PRECISION   ZERO
-      PARAMETER          ( ZERO = 0.0D+0 )
-*     ..
-*     .. Local Scalars ..
-      INTEGER            IX
-      DOUBLE PRECISION   ABSXI
-*     ..
-*     .. External Functions ..
-      LOGICAL            DISNAN
-      EXTERNAL           DISNAN
-*     ..
-*     .. Intrinsic Functions ..
-      INTRINSIC          ABS
-*     ..
-*     .. Executable Statements ..
-*
-      IF( N.GT.0 ) THEN
-         DO 10 IX = 1, 1 + ( N-1 )*INCX, INCX
-            ABSXI = ABS( X( IX ) )
-            IF( ABSXI.GT.ZERO.OR.DISNAN( ABSXI ) ) THEN
-               IF( SCALE.LT.ABSXI ) THEN
-                  SUMSQ = 1 + SUMSQ*( SCALE / ABSXI )**2
-                  SCALE = ABSXI
-               ELSE
-                  SUMSQ = SUMSQ + ( ABSXI / SCALE )**2
-               END IF
-            END IF
-   10    CONTINUE
-      END IF
-      RETURN
-*
-*     End of DLASSQ
-*
-      END