--- rpl/lapack/lapack/zlangt.f 2012/08/22 09:48:35 1.10
+++ rpl/lapack/lapack/zlangt.f 2023/08/07 08:39:29 1.18
@@ -1,25 +1,25 @@
-*> \brief \b ZLANGT
+*> \brief \b ZLANGT returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of a general tridiagonal matrix.
*
* =========== 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 ZLANGT + dependencies
-*>
-*> [TGZ]
-*>
-*> [ZIP]
-*>
+*> Download ZLANGT + dependencies
+*>
+*> [TGZ]
+*>
+*> [ZIP]
+*>
*> [TXT]
-*> \endhtmlonly
+*> \endhtmlonly
*
* Definition:
* ===========
*
* DOUBLE PRECISION FUNCTION ZLANGT( NORM, N, DL, D, DU )
-*
+*
* .. Scalar Arguments ..
* CHARACTER NORM
* INTEGER N
@@ -27,7 +27,7 @@
* .. Array Arguments ..
* COMPLEX*16 D( * ), DL( * ), DU( * )
* ..
-*
+*
*
*> \par Purpose:
* =============
@@ -94,22 +94,19 @@
* 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 complex16OTHERauxiliary
*
* =====================================================================
DOUBLE PRECISION FUNCTION ZLANGT( NORM, N, DL, D, DU )
*
-* -- 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 ..
CHARACTER NORM
@@ -127,17 +124,17 @@
* ..
* .. Local Scalars ..
INTEGER I
- DOUBLE PRECISION ANORM, SCALE, SUM
+ DOUBLE PRECISION ANORM, SCALE, SUM, TEMP
* ..
* .. External Functions ..
- LOGICAL LSAME
- EXTERNAL LSAME
+ LOGICAL LSAME, DISNAN
+ EXTERNAL LSAME, DISNAN
* ..
* .. External Subroutines ..
EXTERNAL ZLASSQ
* ..
* .. Intrinsic Functions ..
- INTRINSIC ABS, MAX, SQRT
+ INTRINSIC ABS, SQRT
* ..
* .. Executable Statements ..
*
@@ -149,9 +146,12 @@
*
ANORM = ABS( D( N ) )
DO 10 I = 1, N - 1
- ANORM = MAX( ANORM, ABS( DL( I ) ) )
- ANORM = MAX( ANORM, ABS( D( I ) ) )
- ANORM = MAX( ANORM, ABS( DU( I ) ) )
+ IF( ANORM.LT.ABS( DL( I ) ) .OR. DISNAN( ABS( DL( I ) ) ) )
+ $ ANORM = ABS(DL(I))
+ IF( ANORM.LT.ABS( D( I ) ) .OR. DISNAN( ABS( D( I ) ) ) )
+ $ ANORM = ABS(D(I))
+ IF( ANORM.LT.ABS( DU( I ) ) .OR. DISNAN (ABS( DU( I ) ) ) )
+ $ ANORM = ABS(DU(I))
10 CONTINUE
ELSE IF( LSAME( NORM, 'O' ) .OR. NORM.EQ.'1' ) THEN
*
@@ -160,11 +160,12 @@
IF( N.EQ.1 ) THEN
ANORM = ABS( D( 1 ) )
ELSE
- ANORM = MAX( ABS( D( 1 ) )+ABS( DL( 1 ) ),
- $ ABS( D( N ) )+ABS( DU( N-1 ) ) )
+ ANORM = ABS( D( 1 ) )+ABS( DL( 1 ) )
+ TEMP = ABS( D( N ) )+ABS( DU( N-1 ) )
+ IF( ANORM .LT. TEMP .OR. DISNAN( TEMP ) ) ANORM = TEMP
DO 20 I = 2, N - 1
- ANORM = MAX( ANORM, ABS( D( I ) )+ABS( DL( I ) )+
- $ ABS( DU( I-1 ) ) )
+ TEMP = ABS( D( I ) )+ABS( DL( I ) )+ABS( DU( I-1 ) )
+ IF( ANORM .LT. TEMP .OR. DISNAN( TEMP ) ) ANORM = TEMP
20 CONTINUE
END IF
ELSE IF( LSAME( NORM, 'I' ) ) THEN
@@ -174,11 +175,12 @@
IF( N.EQ.1 ) THEN
ANORM = ABS( D( 1 ) )
ELSE
- ANORM = MAX( ABS( D( 1 ) )+ABS( DU( 1 ) ),
- $ ABS( D( N ) )+ABS( DL( N-1 ) ) )
+ ANORM = ABS( D( 1 ) )+ABS( DU( 1 ) )
+ TEMP = ABS( D( N ) )+ABS( DL( N-1 ) )
+ IF( ANORM .LT. TEMP .OR. DISNAN( TEMP ) ) ANORM = TEMP
DO 30 I = 2, N - 1
- ANORM = MAX( ANORM, ABS( D( I ) )+ABS( DU( I ) )+
- $ ABS( DL( I-1 ) ) )
+ TEMP = ABS( D( I ) )+ABS( DU( I ) )+ABS( DL( I-1 ) )
+ IF( ANORM .LT. TEMP .OR. DISNAN( TEMP ) ) ANORM = TEMP
30 CONTINUE
END IF
ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN