diff options
Diffstat (limited to 'SRC/slanst.f')
| -rw-r--r-- | SRC/slanst.f | 21 |
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 |