111 SUBROUTINE ztrti2( UPLO, DIAG, N, A, LDA, INFO )
123 COMPLEX*16 a( lda, * )
130 parameter( one = ( 1.0d+0, 0.0d+0 ) )
133 LOGICAL nounit, upper
152 upper =
lsame( uplo,
'U' )
153 nounit =
lsame( diag,
'N' )
154 IF( .NOT.upper .AND. .NOT.
lsame( uplo,
'L' ) )
THEN
156 ELSE IF( .NOT.nounit .AND. .NOT.
lsame( diag,
'U' ) )
THEN
158 ELSE IF( n.LT.0 )
THEN
160 ELSE IF( lda.LT.max( 1, n ) )
THEN
164 CALL
xerbla(
'ZTRTI2', -info )
174 a(
j,
j ) = one / a(
j,
j )
182 CALL
ztrmv(
'Upper',
'No transpose', diag,
j-1, a, lda,
184 CALL
zscal(
j-1, ajj, a( 1,
j ), 1 )
192 a(
j,
j ) = one / a(
j,
j )
201 CALL
ztrmv(
'Lower',
'No transpose', diag, n-
j,
202 $ a(
j+1,
j+1 ), lda, a(
j+1,
j ), 1 )
203 CALL
zscal( n-
j, ajj, a(
j+1,
j ), 1 )