171 SUBROUTINE dsycon_3( UPLO, N, A, LDA, E, IPIV, ANORM, RCOND,
172 $ work, iwork, info )
182 DOUBLE PRECISION ANORM, RCOND
185 INTEGER IPIV( * ), IWORK( * )
186 DOUBLE PRECISION A( lda, * ), E( * ), WORK( * )
192 DOUBLE PRECISION ONE, ZERO
193 parameter ( one = 1.0d+0, zero = 0.0d+0 )
198 DOUBLE PRECISION AINVNM
218 upper = lsame( uplo,
'U' )
219 IF( .NOT.upper .AND. .NOT.lsame( uplo,
'L' ) )
THEN
221 ELSE IF( n.LT.0 )
THEN
223 ELSE IF( lda.LT.max( 1, n ) )
THEN
225 ELSE IF( anorm.LT.zero )
THEN
229 CALL xerbla(
'DSYCON_3', -info )
239 ELSE IF( anorm.LE.zero )
THEN
250 IF( ipiv( i ).GT.0 .AND. a( i, i ).EQ.zero )
258 IF( ipiv( i ).GT.0 .AND. a( i, i ).EQ.zero )
267 CALL dlacn2( n, work( n+1 ), work, iwork, ainvnm, kase, isave )
272 CALL dsytrs_3( uplo, n, 1, a, lda, e, ipiv, work, n, info )
279 $ rcond = ( one / ainvnm ) / anorm
subroutine dsycon_3(UPLO, N, A, LDA, E, IPIV, ANORM, RCOND, WORK, IWORK, INFO)
DSYCON_3
subroutine dlacn2(N, V, X, ISGN, EST, KASE, ISAVE)
DLACN2 estimates the 1-norm of a square matrix, using reverse communication for evaluating matrix-vec...
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine dsytrs_3(UPLO, N, NRHS, A, LDA, E, IPIV, B, LDB, INFO)
DSYTRS_3