121 SUBROUTINE sgeqrs( M, N, NRHS, A, LDA, TAU, B, LDB, WORK, LWORK,
130 INTEGER INFO, LDA, LDB, LWORK, M, N, NRHS
133 REAL A( lda, * ), B( ldb, * ), TAU( * ),
141 parameter( one = 1.0e+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(
'SGEQRS', -info )
175 IF( n.EQ.0 .OR. nrhs.EQ.0 .OR. m.EQ.0 )
180 CALL
sormqr(
'Left',
'Transpose', m, nrhs, n, a, lda, tau, b, ldb,
181 $ work, lwork, info )
185 CALL
strsm(
'Left',
'Upper',
'No transpose',
'Non-unit', n, nrhs,
186 $ one, a, lda, b, ldb )
subroutine sormqr(SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
SORMQR
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine sgeqrs(M, N, NRHS, A, LDA, TAU, B, LDB, WORK, LWORK, INFO)
SGEQRS
subroutine strsm(SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB)
STRSM