--- rpl/lapack/lapack/dlangb.f 2011/11/21 22:19:32 1.9
+++ rpl/lapack/lapack/dlangb.f 2023/08/07 08:38:54 1.19
@@ -1,26 +1,26 @@
-*> \brief \b DLANGB
+*> \brief \b DLANGB returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of general band 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 DLANGB + dependencies
-*>
-*> [TGZ]
-*>
-*> [ZIP]
-*>
+*> Download DLANGB + dependencies
+*>
+*> [TGZ]
+*>
+*> [ZIP]
+*>
*> [TXT]
-*> \endhtmlonly
+*> \endhtmlonly
*
* Definition:
* ===========
*
* DOUBLE PRECISION FUNCTION DLANGB( NORM, N, KL, KU, AB, LDAB,
* WORK )
-*
+*
* .. Scalar Arguments ..
* CHARACTER NORM
* INTEGER KL, KU, LDAB, N
@@ -28,7 +28,7 @@
* .. Array Arguments ..
* DOUBLE PRECISION AB( LDAB, * ), WORK( * )
* ..
-*
+*
*
*> \par Purpose:
* =============
@@ -111,12 +111,10 @@
* 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 doubleGBauxiliary
*
@@ -124,10 +122,9 @@
DOUBLE PRECISION FUNCTION DLANGB( NORM, N, KL, KU, AB, LDAB,
$ WORK )
*
-* -- 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
@@ -146,14 +143,14 @@
* ..
* .. Local Scalars ..
INTEGER I, J, K, L
- DOUBLE PRECISION SCALE, SUM, VALUE
+ DOUBLE PRECISION SCALE, SUM, VALUE, TEMP
* ..
* .. External Subroutines ..
EXTERNAL DLASSQ
* ..
* .. External Functions ..
- LOGICAL LSAME
- EXTERNAL LSAME
+ LOGICAL LSAME, DISNAN
+ EXTERNAL LSAME, DISNAN
* ..
* .. Intrinsic Functions ..
INTRINSIC ABS, MAX, MIN, SQRT
@@ -169,7 +166,8 @@
VALUE = ZERO
DO 20 J = 1, N
DO 10 I = MAX( KU+2-J, 1 ), MIN( N+KU+1-J, KL+KU+1 )
- VALUE = MAX( VALUE, ABS( AB( I, J ) ) )
+ TEMP = ABS( AB( I, J ) )
+ IF( VALUE.LT.TEMP .OR. DISNAN( TEMP ) ) VALUE = TEMP
10 CONTINUE
20 CONTINUE
ELSE IF( ( LSAME( NORM, 'O' ) ) .OR. ( NORM.EQ.'1' ) ) THEN
@@ -182,7 +180,7 @@
DO 30 I = MAX( KU+2-J, 1 ), MIN( N+KU+1-J, KL+KU+1 )
SUM = SUM + ABS( AB( I, J ) )
30 CONTINUE
- VALUE = MAX( VALUE, SUM )
+ IF( VALUE.LT.SUM .OR. DISNAN( SUM ) ) VALUE = SUM
40 CONTINUE
ELSE IF( LSAME( NORM, 'I' ) ) THEN
*
@@ -199,7 +197,8 @@
70 CONTINUE
VALUE = ZERO
DO 80 I = 1, N
- VALUE = MAX( VALUE, WORK( I ) )
+ TEMP = WORK( I )
+ IF( VALUE.LT.TEMP .OR. DISNAN( TEMP ) ) VALUE = TEMP
80 CONTINUE
ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN
*