121 SUBROUTINE cgeqrs( M, N, NRHS, A, LDA, TAU, B, LDB, WORK, LWORK,
130 INTEGER INFO, LDA, LDB, LWORK, M, N, NRHS
133 COMPLEX A( lda, * ), B( ldb, * ), TAU( * ),
141 parameter( one = ( 1.0e+0, 0.0e+0 ) )
156 ELSE IF( n.LT.0 .OR. n.GT.m )
THEN
158 ELSE IF( nrhs.LT.0 )
THEN
160 ELSE IF( lda.LT.max( 1, m ) )
THEN
162 ELSE IF( ldb.LT.max( 1, m ) )
THEN
164 ELSE IF( lwork.LT.1 .OR. lwork.LT.nrhs .AND. m.GT.0 .AND. n.GT.0 )
169 CALL
xerbla(
'CGEQRS', -info )
175 IF( n.EQ.0 .OR. nrhs.EQ.0 .OR. m.EQ.0 )
180 CALL
cunmqr(
'Left',
'Conjugate transpose', m, nrhs, n, a, lda,
181 $ tau, b, ldb, work, lwork, info )
185 CALL
ctrsm(
'Left',
'Upper',
'No transpose',
'Non-unit', n, nrhs,
186 $ one, a, lda, b, ldb )
subroutine ctrsm(SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB)
CTRSM
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine cgeqrs(M, N, NRHS, A, LDA, TAU, B, LDB, WORK, LWORK, INFO)
CGEQRS
subroutine cunmqr(SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
CUNMQR