version 1.15, 2017/06/17 10:53:54
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version 1.18, 2020/05/21 21:45:59
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* December 2016 |
* December 2016 |
* |
* |
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IMPLICIT NONE |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER DIAG, NORM, UPLO |
CHARACTER DIAG, NORM, UPLO |
INTEGER N |
INTEGER N |
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* .. Local Scalars .. |
* .. Local Scalars .. |
LOGICAL UDIAG |
LOGICAL UDIAG |
INTEGER I, J, K |
INTEGER I, J, K |
DOUBLE PRECISION SCALE, SUM, VALUE |
DOUBLE PRECISION SUM, VALUE |
* .. |
* .. |
* .. External Subroutines .. |
* .. Local Arrays .. |
EXTERNAL DLASSQ |
DOUBLE PRECISION SSQ( 2 ), COLSSQ( 2 ) |
* .. |
* .. |
* .. External Functions .. |
* .. External Functions .. |
LOGICAL LSAME, DISNAN |
LOGICAL LSAME, DISNAN |
EXTERNAL LSAME, DISNAN |
EXTERNAL LSAME, DISNAN |
* .. |
* .. |
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* .. External Subroutines .. |
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EXTERNAL DLASSQ, DCOMBSSQ |
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* .. |
* .. Intrinsic Functions .. |
* .. Intrinsic Functions .. |
INTRINSIC ABS, SQRT |
INTRINSIC ABS, SQRT |
* .. |
* .. |
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ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN |
ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN |
* |
* |
* Find normF(A). |
* Find normF(A). |
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* SSQ(1) is scale |
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* SSQ(2) is sum-of-squares |
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* For better accuracy, sum each column separately. |
* |
* |
IF( LSAME( UPLO, 'U' ) ) THEN |
IF( LSAME( UPLO, 'U' ) ) THEN |
IF( LSAME( DIAG, 'U' ) ) THEN |
IF( LSAME( DIAG, 'U' ) ) THEN |
SCALE = ONE |
SSQ( 1 ) = ONE |
SUM = N |
SSQ( 2 ) = N |
K = 2 |
K = 2 |
DO 280 J = 2, N |
DO 280 J = 2, N |
CALL DLASSQ( J-1, AP( K ), 1, SCALE, SUM ) |
COLSSQ( 1 ) = ZERO |
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COLSSQ( 2 ) = ONE |
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CALL DLASSQ( J-1, AP( K ), 1, |
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$ COLSSQ( 1 ), COLSSQ( 2 ) ) |
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CALL DCOMBSSQ( SSQ, COLSSQ ) |
K = K + J |
K = K + J |
280 CONTINUE |
280 CONTINUE |
ELSE |
ELSE |
SCALE = ZERO |
SSQ( 1 ) = ZERO |
SUM = ONE |
SSQ( 2 ) = ONE |
K = 1 |
K = 1 |
DO 290 J = 1, N |
DO 290 J = 1, N |
CALL DLASSQ( J, AP( K ), 1, SCALE, SUM ) |
COLSSQ( 1 ) = ZERO |
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COLSSQ( 2 ) = ONE |
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CALL DLASSQ( J, AP( K ), 1, |
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$ COLSSQ( 1 ), COLSSQ( 2 ) ) |
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CALL DCOMBSSQ( SSQ, COLSSQ ) |
K = K + J |
K = K + J |
290 CONTINUE |
290 CONTINUE |
END IF |
END IF |
ELSE |
ELSE |
IF( LSAME( DIAG, 'U' ) ) THEN |
IF( LSAME( DIAG, 'U' ) ) THEN |
SCALE = ONE |
SSQ( 1 ) = ONE |
SUM = N |
SSQ( 2 ) = N |
K = 2 |
K = 2 |
DO 300 J = 1, N - 1 |
DO 300 J = 1, N - 1 |
CALL DLASSQ( N-J, AP( K ), 1, SCALE, SUM ) |
COLSSQ( 1 ) = ZERO |
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COLSSQ( 2 ) = ONE |
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CALL DLASSQ( N-J, AP( K ), 1, |
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$ COLSSQ( 1 ), COLSSQ( 2 ) ) |
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CALL DCOMBSSQ( SSQ, COLSSQ ) |
K = K + N - J + 1 |
K = K + N - J + 1 |
300 CONTINUE |
300 CONTINUE |
ELSE |
ELSE |
SCALE = ZERO |
SSQ( 1 ) = ZERO |
SUM = ONE |
SSQ( 2 ) = ONE |
K = 1 |
K = 1 |
DO 310 J = 1, N |
DO 310 J = 1, N |
CALL DLASSQ( N-J+1, AP( K ), 1, SCALE, SUM ) |
COLSSQ( 1 ) = ZERO |
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COLSSQ( 2 ) = ONE |
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CALL DLASSQ( N-J+1, AP( K ), 1, |
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$ COLSSQ( 1 ), COLSSQ( 2 ) ) |
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CALL DCOMBSSQ( SSQ, COLSSQ ) |
K = K + N - J + 1 |
K = K + N - J + 1 |
310 CONTINUE |
310 CONTINUE |
END IF |
END IF |
END IF |
END IF |
VALUE = SCALE*SQRT( SUM ) |
VALUE = SSQ( 1 )*SQRT( SSQ( 2 ) ) |
END IF |
END IF |
* |
* |
DLANTP = VALUE |
DLANTP = VALUE |