180 SUBROUTINE cgglse( M, N, P, A, LDA, B, LDB, C, D, X, WORK, LWORK,
189 INTEGER INFO, LDA, LDB, LWORK, M, N, P
192 COMPLEX A( lda, * ), B( ldb, * ), C( * ), D( * ),
200 parameter ( cone = ( 1.0e+0, 0.0e+0 ) )
204 INTEGER LOPT, LWKMIN, LWKOPT, MN, NB, NB1, NB2, NB3,
216 INTRINSIC int, max, min
224 lquery = ( lwork.EQ.-1 )
227 ELSE IF( n.LT.0 )
THEN
229 ELSE IF( p.LT.0 .OR. p.GT.n .OR. p.LT.n-m )
THEN
231 ELSE IF( lda.LT.max( 1, m ) )
THEN
233 ELSE IF( ldb.LT.max( 1, p ) )
THEN
244 nb1 = ilaenv( 1,
'CGEQRF',
' ', m, n, -1, -1 )
245 nb2 = ilaenv( 1,
'CGERQF',
' ', m, n, -1, -1 )
246 nb3 = ilaenv( 1,
'CUNMQR',
' ', m, n, p, -1 )
247 nb4 = ilaenv( 1,
'CUNMRQ',
' ', m, n, p, -1 )
248 nb = max( nb1, nb2, nb3, nb4 )
250 lwkopt = p + mn + max( m, n )*nb
254 IF( lwork.LT.lwkmin .AND. .NOT.lquery )
THEN
260 CALL xerbla(
'CGGLSE', -info )
262 ELSE IF( lquery )
THEN
280 CALL cggrqf( p, m, n, b, ldb, work, a, lda, work( p+1 ),
281 $ work( p+mn+1 ), lwork-p-mn, info )
282 lopt = work( p+mn+1 )
287 CALL cunmqr(
'Left',
'Conjugate Transpose', m, 1, mn, a, lda,
288 $ work( p+1 ), c, max( 1, m ), work( p+mn+1 ),
290 lopt = max( lopt, int( work( p+mn+1 ) ) )
295 CALL ctrtrs(
'Upper',
'No transpose',
'Non-unit', p, 1,
296 $ b( 1, n-p+1 ), ldb, d, p, info )
305 CALL ccopy( p, d, 1, x( n-p+1 ), 1 )
309 CALL cgemv(
'No transpose', n-p, p, -cone, a( 1, n-p+1 ), lda,
316 CALL ctrtrs(
'Upper',
'No transpose',
'Non-unit', n-p, 1,
317 $ a, lda, c, n-p, info )
326 CALL ccopy( n-p, c, 1, x, 1 )
334 $
CALL cgemv(
'No transpose', nr, n-m, -cone, a( n-p+1, m+1 ),
335 $ lda, d( nr+1 ), 1, cone, c( n-p+1 ), 1 )
340 CALL ctrmv(
'Upper',
'No transpose',
'Non unit', nr,
341 $ a( n-p+1, n-p+1 ), lda, d, 1 )
342 CALL caxpy( nr, -cone, d, 1, c( n-p+1 ), 1 )
347 CALL cunmrq(
'Left',
'Conjugate Transpose', n, 1, p, b, ldb,
348 $ work( 1 ), x, n, work( p+mn+1 ), lwork-p-mn, info )
349 work( 1 ) = p + mn + max( lopt, int( work( p+mn+1 ) ) )
subroutine cggrqf(M, P, N, A, LDA, TAUA, B, LDB, TAUB, WORK, LWORK, INFO)
CGGRQF
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine cunmrq(SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
CUNMRQ
subroutine cunmqr(SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
CUNMQR
subroutine cgemv(TRANS, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CGEMV
subroutine ctrtrs(UPLO, TRANS, DIAG, N, NRHS, A, LDA, B, LDB, INFO)
CTRTRS
subroutine cgglse(M, N, P, A, LDA, B, LDB, C, D, X, WORK, LWORK, INFO)
CGGLSE solves overdetermined or underdetermined systems for OTHER matrices
subroutine ctrmv(UPLO, TRANS, DIAG, N, A, LDA, X, INCX)
CTRMV
subroutine ccopy(N, CX, INCX, CY, INCY)
CCOPY
subroutine caxpy(N, CA, CX, INCX, CY, INCY)
CAXPY