--- rpl/lapack/lapack/zlartg.f 2011/11/21 22:19:53 1.9
+++ rpl/lapack/lapack/zlartg.f 2017/06/17 11:06:56 1.17
@@ -1,30 +1,30 @@
-*> \brief \b ZLARTG
+*> \brief \b ZLARTG generates a plane rotation with real cosine and complex sine.
*
* =========== DOCUMENTATION ===========
*
-* Online html documentation available at
-* http://www.netlib.org/lapack/explore-html/
+* Online html documentation available at
+* http://www.netlib.org/lapack/explore-html/
*
*> \htmlonly
-*> Download ZLARTG + dependencies
-*>
-*> [TGZ]
-*>
-*> [ZIP]
-*>
+*> Download ZLARTG + dependencies
+*>
+*> [TGZ]
+*>
+*> [ZIP]
+*>
*> [TXT]
-*> \endhtmlonly
+*> \endhtmlonly
*
* Definition:
* ===========
*
* SUBROUTINE ZLARTG( F, G, CS, SN, R )
-*
+*
* .. Scalar Arguments ..
* DOUBLE PRECISION CS
* COMPLEX*16 F, G, R, SN
* ..
-*
+*
*
*> \par Purpose:
* =============
@@ -80,12 +80,12 @@
* Authors:
* ========
*
-*> \author Univ. of Tennessee
-*> \author Univ. of California Berkeley
-*> \author Univ. of Colorado Denver
-*> \author NAG Ltd.
+*> \author Univ. of Tennessee
+*> \author Univ. of California Berkeley
+*> \author Univ. of Colorado Denver
+*> \author NAG Ltd.
*
-*> \date November 2011
+*> \date December 2016
*
*> \ingroup complex16OTHERauxiliary
*
@@ -103,10 +103,10 @@
* =====================================================================
SUBROUTINE ZLARTG( F, G, CS, SN, R )
*
-* -- LAPACK auxiliary routine (version 3.4.0) --
+* -- LAPACK auxiliary routine (version 3.7.0) --
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-* November 2011
+* December 2016
*
* .. Scalar Arguments ..
DOUBLE PRECISION CS
@@ -130,7 +130,8 @@
* ..
* .. External Functions ..
DOUBLE PRECISION DLAMCH, DLAPY2
- EXTERNAL DLAMCH, DLAPY2
+ LOGICAL DISNAN
+ EXTERNAL DLAMCH, DLAPY2, DISNAN
* ..
* .. Intrinsic Functions ..
INTRINSIC ABS, DBLE, DCMPLX, DCONJG, DIMAG, INT, LOG,
@@ -139,26 +140,17 @@
* .. Statement Functions ..
DOUBLE PRECISION ABS1, ABSSQ
* ..
-* .. Save statement ..
-* SAVE FIRST, SAFMX2, SAFMIN, SAFMN2
-* ..
-* .. Data statements ..
-* DATA FIRST / .TRUE. /
-* ..
* .. Statement Function definitions ..
ABS1( FF ) = MAX( ABS( DBLE( FF ) ), ABS( DIMAG( FF ) ) )
ABSSQ( FF ) = DBLE( FF )**2 + DIMAG( FF )**2
* ..
* .. Executable Statements ..
*
-* IF( FIRST ) THEN
- SAFMIN = DLAMCH( 'S' )
- EPS = DLAMCH( 'E' )
- SAFMN2 = DLAMCH( 'B' )**INT( LOG( SAFMIN / EPS ) /
- $ LOG( DLAMCH( 'B' ) ) / TWO )
- SAFMX2 = ONE / SAFMN2
-* FIRST = .FALSE.
-* END IF
+ SAFMIN = DLAMCH( 'S' )
+ EPS = DLAMCH( 'E' )
+ SAFMN2 = DLAMCH( 'B' )**INT( LOG( SAFMIN / EPS ) /
+ $ LOG( DLAMCH( 'B' ) ) / TWO )
+ SAFMX2 = ONE / SAFMN2
SCALE = MAX( ABS1( F ), ABS1( G ) )
FS = F
GS = G
@@ -172,7 +164,7 @@
IF( SCALE.GE.SAFMX2 )
$ GO TO 10
ELSE IF( SCALE.LE.SAFMN2 ) THEN
- IF( G.EQ.CZERO ) THEN
+ IF( G.EQ.CZERO.OR.DISNAN( ABS( G ) ) ) THEN
CS = ONE
SN = CZERO
R = F