121 SUBROUTINE sgelqs( 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( zero = 0.0e+0, one = 1.0e+0 )
156 ELSE IF( n.LT.0 .OR. m.GT.n )
THEN
158 ELSE IF( nrhs.LT.0 )
THEN
160 ELSE IF( lda.LT.max( 1, m ) )
THEN
162 ELSE IF( ldb.LT.max( 1, n ) )
THEN
164 ELSE IF( lwork.LT.1 .OR. lwork.LT.nrhs .AND. m.GT.0 .AND. n.GT.0 )
169 CALL
xerbla(
'SGELQS', -info )
175 IF( n.EQ.0 .OR. nrhs.EQ.0 .OR. m.EQ.0 )
180 CALL
strsm(
'Left',
'Lower',
'No transpose',
'Non-unit', m, nrhs,
181 $ one, a, lda,
b, ldb )
186 $ CALL
slaset(
'Full', n-m, nrhs, zero, zero,
b( m+1, 1 ), ldb )
190 CALL
sormlq(
'Left',
'Transpose', n, nrhs, m, a, lda, tau,
b, ldb,
191 $ work, lwork, info )
subroutine slaset(UPLO, M, N, ALPHA, BETA, A, LDA)
SLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values...
subroutine sormlq(SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
SORMLQ
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine sgelqs(M, N, NRHS, A, LDA, TAU, B, LDB, WORK, LWORK, INFO)
SGELQS
set ue cd $ADTTMP cat<< EOF > tmp f Program LinearEquations Implicit none Real b(3) integer i
subroutine strsm(SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB)
STRSM