139 SUBROUTINE checon_rook( UPLO, N, A, LDA, IPIV, ANORM, RCOND, WORK,
154 COMPLEX a( lda, * ), work( * )
161 parameter( one = 1.0e+0, zero = 0.0e+0 )
186 upper =
lsame( uplo,
'U' )
187 IF( .NOT.upper .AND. .NOT.
lsame( uplo,
'L' ) )
THEN
189 ELSE IF( n.LT.0 )
THEN
191 ELSE IF( lda.LT.max( 1, n ) )
THEN
193 ELSE IF( anorm.LT.zero )
THEN
197 CALL
xerbla(
'CHECON_ROOK', -info )
207 ELSE IF( anorm.LE.zero )
THEN
218 IF( ipiv( i ).GT.0 .AND. a( i, i ).EQ.zero )
226 IF( ipiv( i ).GT.0 .AND. a( i, i ).EQ.zero )
235 CALL
clacn2( n, work( n+1 ), work, ainvnm, kase, isave )
240 CALL
chetrs_rook( uplo, n, 1, a, lda, ipiv, work, n, info )
247 $ rcond = ( one / ainvnm ) / anorm