SUBROUTINE ZGTTS2( ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB )
INTEGER ITRANS, LDB, N, NRHS
INTEGER IPIV( * )
COMPLEX*16 B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( * )
INTEGER I, J
COMPLEX*16 TEMP
INTRINSIC DCONJG
IF( N.EQ.0 .OR. NRHS.EQ.0 )
$ RETURN
IF( ITRANS.EQ.0 ) THEN
IF( NRHS.LE.1 ) THEN
J = 1
10 CONTINUE
DO 20 I = 1, N - 1
IF( IPIV( I ).EQ.I ) THEN
B( I+1, J ) = B( I+1, J ) - DL( I )*B( I, J )
ELSE
TEMP = B( I, J )
B( I, J ) = B( I+1, J )
B( I+1, J ) = TEMP - DL( I )*B( I, J )
END IF
20 CONTINUE
B( N, J ) = B( N, J ) / D( N )
IF( N.GT.1 )
$ B( N-1, J ) = ( B( N-1, J )-DU( N-1 )*B( N, J ) ) /
$ D( N-1 )
DO 30 I = N - 2, 1, -1
B( I, J ) = ( B( I, J )-DU( I )*B( I+1, J )-DU2( I )*
$ B( I+2, J ) ) / D( I )
30 CONTINUE
IF( J.LT.NRHS ) THEN
J = J + 1
GO TO 10
END IF
ELSE
DO 60 J = 1, NRHS
DO 40 I = 1, N - 1
IF( IPIV( I ).EQ.I ) THEN
B( I+1, J ) = B( I+1, J ) - DL( I )*B( I, J )
ELSE
TEMP = B( I, J )
B( I, J ) = B( I+1, J )
B( I+1, J ) = TEMP - DL( I )*B( I, J )
END IF
40 CONTINUE
B( N, J ) = B( N, J ) / D( N )
IF( N.GT.1 )
$ B( N-1, J ) = ( B( N-1, J )-DU( N-1 )*B( N, J ) ) /
$ D( N-1 )
DO 50 I = N - 2, 1, -1
B( I, J ) = ( B( I, J )-DU( I )*B( I+1, J )-DU2( I )*
$ B( I+2, J ) ) / D( I )
50 CONTINUE
60 CONTINUE
END IF
ELSE IF( ITRANS.EQ.1 ) THEN
IF( NRHS.LE.1 ) THEN
J = 1
70 CONTINUE
B( 1, J ) = B( 1, J ) / D( 1 )
IF( N.GT.1 )
$ B( 2, J ) = ( B( 2, J )-DU( 1 )*B( 1, J ) ) / D( 2 )
DO 80 I = 3, N
B( I, J ) = ( B( I, J )-DU( I-1 )*B( I-1, J )-DU2( I-2 )*
$ B( I-2, J ) ) / D( I )
80 CONTINUE
DO 90 I = N - 1, 1, -1
IF( IPIV( I ).EQ.I ) THEN
B( I, J ) = B( I, J ) - DL( I )*B( I+1, J )
ELSE
TEMP = B( I+1, J )
B( I+1, J ) = B( I, J ) - DL( I )*TEMP
B( I, J ) = TEMP
END IF
90 CONTINUE
IF( J.LT.NRHS ) THEN
J = J + 1
GO TO 70
END IF
ELSE
DO 120 J = 1, NRHS
B( 1, J ) = B( 1, J ) / D( 1 )
IF( N.GT.1 )
$ B( 2, J ) = ( B( 2, J )-DU( 1 )*B( 1, J ) ) / D( 2 )
DO 100 I = 3, N
B( I, J ) = ( B( I, J )-DU( I-1 )*B( I-1, J )-
$ DU2( I-2 )*B( I-2, J ) ) / D( I )
100 CONTINUE
DO 110 I = N - 1, 1, -1
IF( IPIV( I ).EQ.I ) THEN
B( I, J ) = B( I, J ) - DL( I )*B( I+1, J )
ELSE
TEMP = B( I+1, J )
B( I+1, J ) = B( I, J ) - DL( I )*TEMP
B( I, J ) = TEMP
END IF
110 CONTINUE
120 CONTINUE
END IF
ELSE
IF( NRHS.LE.1 ) THEN
J = 1
130 CONTINUE
B( 1, J ) = B( 1, J ) / DCONJG( D( 1 ) )
IF( N.GT.1 )
$ B( 2, J ) = ( B( 2, J )-DCONJG( DU( 1 ) )*B( 1, J ) ) /
$ DCONJG( D( 2 ) )
DO 140 I = 3, N
B( I, J ) = ( B( I, J )-DCONJG( DU( I-1 ) )*B( I-1, J )-
$ DCONJG( DU2( I-2 ) )*B( I-2, J ) ) /
$ DCONJG( D( I ) )
140 CONTINUE
DO 150 I = N - 1, 1, -1
IF( IPIV( I ).EQ.I ) THEN
B( I, J ) = B( I, J ) - DCONJG( DL( I ) )*B( I+1, J )
ELSE
TEMP = B( I+1, J )
B( I+1, J ) = B( I, J ) - DCONJG( DL( I ) )*TEMP
B( I, J ) = TEMP
END IF
150 CONTINUE
IF( J.LT.NRHS ) THEN
J = J + 1
GO TO 130
END IF
ELSE
DO 180 J = 1, NRHS
B( 1, J ) = B( 1, J ) / DCONJG( D( 1 ) )
IF( N.GT.1 )
$ B( 2, J ) = ( B( 2, J )-DCONJG( DU( 1 ) )*B( 1, J ) )
$ / DCONJG( D( 2 ) )
DO 160 I = 3, N
B( I, J ) = ( B( I, J )-DCONJG( DU( I-1 ) )*
$ B( I-1, J )-DCONJG( DU2( I-2 ) )*
$ B( I-2, J ) ) / DCONJG( D( I ) )
160 CONTINUE
DO 170 I = N - 1, 1, -1
IF( IPIV( I ).EQ.I ) THEN
B( I, J ) = B( I, J ) - DCONJG( DL( I ) )*
$ B( I+1, J )
ELSE
TEMP = B( I+1, J )
B( I+1, J ) = B( I, J ) - DCONJG( DL( I ) )*TEMP
B( I, J ) = TEMP
END IF
170 CONTINUE
180 CONTINUE
END IF
END IF
END