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-rw-r--r--SRC/slangt.f35
1 files changed, 20 insertions, 15 deletions
diff --git a/SRC/slangt.f b/SRC/slangt.f
index cfbb68e1..55d92cc2 100644
--- a/SRC/slangt.f
+++ b/SRC/slangt.f
@@ -127,17 +127,17 @@
* ..
* .. Local Scalars ..
INTEGER I
- REAL ANORM, SCALE, SUM
+ REAL ANORM, SCALE, SUM, TEMP
* ..
* .. 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 ..
*
@@ -149,9 +149,12 @@
*
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. SISNAN( ABS( DL( I ) ) ) )
+ $ ANORM = ABS(DL(I))
+ IF( ANORM.LT.ABS( D( I ) ) .OR. SISNAN( ABS( D( I ) ) ) )
+ $ ANORM = ABS(D(I))
+ IF( ANORM.LT.ABS( DU( I ) ) .OR. SISNAN (ABS( DU( I ) ) ) )
+ $ ANORM = ABS(DU(I))
10 CONTINUE
ELSE IF( LSAME( NORM, 'O' ) .OR. NORM.EQ.'1' ) THEN
*
@@ -160,11 +163,12 @@
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. SISNAN( 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. SISNAN( TEMP ) ) ANORM = TEMP
20 CONTINUE
END IF
ELSE IF( LSAME( NORM, 'I' ) ) THEN
@@ -174,11 +178,12 @@
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. SISNAN( 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. SISNAN( TEMP ) ) ANORM = TEMP
30 CONTINUE
END IF
ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN