189 SUBROUTINE stplqt( M, N, L, MB, A, LDA, B, LDB, T, LDT, WORK,
198 INTEGER INFO, LDA, LDB, LDT, N, M, L, MB
201 REAL A( lda, * ), B( ldb, * ), T( ldt, * ), WORK( * )
208 INTEGER I, IB, LB, NB, IINFO
220 ELSE IF( n.LT.0 )
THEN
222 ELSE IF( l.LT.0 .OR. (l.GT.min(m,n) .AND. min(m,n).GE.0))
THEN
224 ELSE IF( mb.LT.1 .OR. (mb.GT.m .AND. m.GT.0))
THEN
226 ELSE IF( lda.LT.max( 1, m ) )
THEN
228 ELSE IF( ldb.LT.max( 1, m ) )
THEN
230 ELSE IF( ldt.LT.mb )
THEN
234 CALL xerbla(
'STPLQT', -info )
240 IF( m.EQ.0 .OR. n.EQ.0 )
RETURN
246 ib = min( m-i+1, mb )
247 nb = min( n-l+i+ib-1, n )
254 CALL stplqt2( ib, nb, lb, a(i,i), lda, b( i, 1 ), ldb,
255 $ t(1, i ), ldt, iinfo )
260 CALL stprfb(
'R',
'N',
'F',
'R', m-i-ib+1, nb, ib, lb,
261 $ b( i, 1 ), ldb, t( 1, i ), ldt,
262 $ a( i+ib, i ), lda, b( i+ib, 1 ), ldb,
subroutine stplqt(M, N, L, MB, A, LDA, B, LDB, T, LDT, WORK, INFO)
STPLQT
subroutine stprfb(SIDE, TRANS, DIRECT, STOREV, M, N, K, L, V, LDV, T, LDT, A, LDA, B, LDB, WORK, LDWORK)
STPRFB applies a real or complex "triangular-pentagonal" blocked reflector to a real or complex matri...
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine stplqt2(M, N, L, A, LDA, B, LDB, T, LDT, INFO)
STPLQT2 computes a LQ factorization of a real or complex "triangular-pentagonal" matrix, which is composed of a triangular block and a pentagonal block, using the compact WY representation for Q.