--- rpl/lapack/lapack/dlarrk.f 2011/11/21 20:42:58 1.8
+++ rpl/lapack/lapack/dlarrk.f 2023/08/07 08:38:57 1.19
@@ -1,26 +1,26 @@
-*> \brief \b DLARRK
+*> \brief \b DLARRK computes one eigenvalue of a symmetric tridiagonal matrix T to suitable accuracy.
*
* =========== 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 DLARRK + dependencies
-*>
-*> [TGZ]
-*>
-*> [ZIP]
-*>
+*> Download DLARRK + dependencies
+*>
+*> [TGZ]
+*>
+*> [ZIP]
+*>
*> [TXT]
-*> \endhtmlonly
+*> \endhtmlonly
*
* Definition:
* ===========
*
* SUBROUTINE DLARRK( N, IW, GL, GU,
* D, E2, PIVMIN, RELTOL, W, WERR, INFO)
-*
+*
* .. Scalar Arguments ..
* INTEGER INFO, IW, N
* DOUBLE PRECISION PIVMIN, RELTOL, GL, GU, W, WERR
@@ -28,7 +28,7 @@
* .. Array Arguments ..
* DOUBLE PRECISION D( * ), E2( * )
* ..
-*
+*
*
*> \par Purpose:
* =============
@@ -132,23 +132,20 @@
* Authors:
* ========
*
-*> \author Univ. of Tennessee
-*> \author Univ. of California Berkeley
-*> \author Univ. of Colorado Denver
-*> \author NAG Ltd.
-*
-*> \date November 2011
+*> \author Univ. of Tennessee
+*> \author Univ. of California Berkeley
+*> \author Univ. of Colorado Denver
+*> \author NAG Ltd.
*
-*> \ingroup auxOTHERauxiliary
+*> \ingroup OTHERauxiliary
*
* =====================================================================
SUBROUTINE DLARRK( N, IW, GL, GU,
$ D, E2, PIVMIN, RELTOL, W, WERR, INFO)
*
-* -- LAPACK auxiliary routine (version 3.4.0) --
+* -- LAPACK auxiliary routine --
* -- 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 ..
INTEGER INFO, IW, N
@@ -179,6 +176,13 @@
* ..
* .. Executable Statements ..
*
+* Quick return if possible
+*
+ IF( N.LE.0 ) THEN
+ INFO = 0
+ RETURN
+ END IF
+*
* Get machine constants
EPS = DLAMCH( 'P' )