summaryrefslogtreecommitdiff
path: root/SRC/slanst.f
diff options
context:
space:
mode:
Diffstat (limited to 'SRC/slanst.f')
-rw-r--r--SRC/slanst.f21
1 files changed, 12 insertions, 9 deletions
diff --git a/SRC/slanst.f b/SRC/slanst.f
index d25e096d..3a61850e 100644
--- a/SRC/slanst.f
+++ b/SRC/slanst.f
@@ -124,14 +124,14 @@
REAL ANORM, SCALE, SUM
* ..
* .. External Functions ..
- LOGICAL LSAME
- EXTERNAL LSAME
+ LOGICAL LSAME, SISNAN
+ EXTERNAL LSAME, SISNAN
* ..
* .. External Subroutines ..
EXTERNAL SLASSQ
* ..
* .. Intrinsic Functions ..
- INTRINSIC ABS, MAX, SQRT
+ INTRINSIC ABS, SQRT
* ..
* .. Executable Statements ..
*
@@ -143,8 +143,10 @@
*
ANORM = ABS( D( N ) )
DO 10 I = 1, N - 1
- ANORM = MAX( ANORM, ABS( D( I ) ) )
- ANORM = MAX( ANORM, ABS( E( I ) ) )
+ SUM = ABS( D( I ) )
+ IF( ANORM .LT. SUM .OR. SISNAN( SUM ) ) ANORM = SUM
+ SUM = ABS( E( I ) )
+ IF( ANORM .LT. SUM .OR. SISNAN( SUM ) ) ANORM = SUM
10 CONTINUE
ELSE IF( LSAME( NORM, 'O' ) .OR. NORM.EQ.'1' .OR.
$ LSAME( NORM, 'I' ) ) THEN
@@ -154,11 +156,12 @@
IF( N.EQ.1 ) THEN
ANORM = ABS( D( 1 ) )
ELSE
- ANORM = MAX( ABS( D( 1 ) )+ABS( E( 1 ) ),
- $ ABS( E( N-1 ) )+ABS( D( N ) ) )
+ ANORM = ABS( D( 1 ) )+ABS( E( 1 ) )
+ SUM = ABS( E( N-1 ) )+ABS( D( N ) )
+ IF( ANORM .LT. SUM .OR. SISNAN( SUM ) ) ANORM = SUM
DO 20 I = 2, N - 1
- ANORM = MAX( ANORM, ABS( D( I ) )+ABS( E( I ) )+
- $ ABS( E( I-1 ) ) )
+ SUM = ABS( D( I ) )+ABS( E( I ) )+ABS( E( I-1 ) )
+ IF( ANORM .LT. SUM .OR. SISNAN( SUM ) ) ANORM = SUM
20 CONTINUE
END IF
ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN