Refs #247. Included lapack source codes. Avoid downloading tar.gz from netlib.org

Based on 3.4.2 version, apply patch.for_lapack-3.4.2.

lapack-netlib/TESTING/EIG/sslect.f

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+*> \brief \b SSLECT
+*
+*  =========== DOCUMENTATION ===========
+*
+* Online html documentation available at 
+*            http://www.netlib.org/lapack/explore-html/ 
+*
+*  Definition:
+*  ===========
+*
+*       LOGICAL          FUNCTION SSLECT( ZR, ZI )
+* 
+*       .. Scalar Arguments ..
+*       REAL               ZI, ZR
+*       ..
+*  
+*
+*> \par Purpose:
+*  =============
+*>
+*> \verbatim
+*>
+*> SSLECT returns .TRUE. if the eigenvalue ZR+sqrt(-1)*ZI is to be
+*> selected, and otherwise it returns .FALSE.
+*> It is used by SCHK41 to test if SGEES succesfully sorts eigenvalues,
+*> and by SCHK43 to test if SGEESX succesfully sorts eigenvalues.
+*>
+*> The common block /SSLCT/ controls how eigenvalues are selected.
+*> If SELOPT = 0, then SSLECT return .TRUE. when ZR is less than zero,
+*> and .FALSE. otherwise.
+*> If SELOPT is at least 1, SSLECT returns SELVAL(SELOPT) and adds 1
+*> to SELOPT, cycling back to 1 at SELMAX.
+*> \endverbatim
+*
+*  Arguments:
+*  ==========
+*
+*> \param[in] ZR
+*> \verbatim
+*>          ZR is REAL
+*>          The real part of a complex eigenvalue ZR + i*ZI.
+*> \endverbatim
+*>
+*> \param[in] ZI
+*> \verbatim
+*>          ZI is REAL
+*>          The imaginary part of a complex eigenvalue ZR + i*ZI.
+*> \endverbatim
+*
+*  Authors:
+*  ========
+*
+*> \author Univ. of Tennessee 
+*> \author Univ. of California Berkeley 
+*> \author Univ. of Colorado Denver 
+*> \author NAG Ltd. 
+*
+*> \date November 2011
+*
+*> \ingroup single_eig
+*
+*  =====================================================================
+      LOGICAL          FUNCTION SSLECT( ZR, ZI )
+*
+*  -- LAPACK test routine (version 3.4.0) --
+*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
+*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
+*     November 2011
+*
+*     .. Scalar Arguments ..
+      REAL               ZI, ZR
+*     ..
+*
+*  =====================================================================
+*
+*     .. Arrays in Common ..
+      LOGICAL            SELVAL( 20 )
+      REAL               SELWI( 20 ), SELWR( 20 )
+*     ..
+*     .. Scalars in Common ..
+      INTEGER            SELDIM, SELOPT
+*     ..
+*     .. Common blocks ..
+      COMMON             / SSLCT / SELOPT, SELDIM, SELVAL, SELWR, SELWI
+*     ..
+*     .. Local Scalars ..
+      INTEGER            I
+      REAL               RMIN, X
+*     ..
+*     .. Parameters ..
+      REAL               ZERO
+      PARAMETER          ( ZERO = 0.0E0 )
+*     ..
+*     .. External Functions ..
+      REAL               SLAPY2
+      EXTERNAL           SLAPY2
+*     ..
+*     .. Executable Statements ..
+*
+      IF( SELOPT.EQ.0 ) THEN
+         SSLECT = ( ZR.LT.ZERO )
+      ELSE
+         RMIN = SLAPY2( ZR-SELWR( 1 ), ZI-SELWI( 1 ) )
+         SSLECT = SELVAL( 1 )
+         DO 10 I = 2, SELDIM
+            X = SLAPY2( ZR-SELWR( I ), ZI-SELWI( I ) )
+            IF( X.LE.RMIN ) THEN
+               RMIN = X
+               SSLECT = SELVAL( I )
+            END IF
+   10    CONTINUE
+      END IF
+      RETURN
+*
+*     End of SSLECT
+*
+      END