126 SUBROUTINE slqt01( M, N, A, AF, Q, L, LDA, TAU, WORK, LWORK,
135 INTEGER LDA, LWORK, M, N
138 REAL A( lda, * ), AF( lda, * ), L( lda, * ),
139 $ q( lda, * ), result( * ), rwork( * ), tau( * ),
147 parameter( zero = 0.0e+0, one = 1.0e+0 )
149 parameter( rogue = -1.0e+10 )
153 REAL ANORM, EPS, RESID
156 REAL SLAMCH, SLANGE, SLANSY
157 EXTERNAL slamch, slange, slansy
163 INTRINSIC max, min, real
169 COMMON / srnamc / srnamt
174 eps = slamch(
'Epsilon' )
178 CALL
slacpy(
'Full', m, n, a, lda, af, lda )
183 CALL
sgelqf( m, n, af, lda, tau, work, lwork, info )
187 CALL
slaset(
'Full', n, n, rogue, rogue, q, lda )
189 $ CALL
slacpy(
'Upper', m, n-1, af( 1, 2 ), lda, q( 1, 2 ), lda )
194 CALL
sorglq( n, n, minmn, q, lda, tau, work, lwork, info )
198 CALL
slaset(
'Full', m, n, zero, zero, l, lda )
199 CALL
slacpy(
'Lower', m, n, af, lda, l, lda )
203 CALL
sgemm(
'No transpose',
'Transpose', m, n, n, -one, a, lda, q,
208 anorm = slange(
'1', m, n, a, lda, rwork )
209 resid = slange(
'1', m, n, l, lda, rwork )
210 IF( anorm.GT.zero )
THEN
211 result( 1 ) = ( ( resid /
REAL( MAX( 1, N ) ) ) / anorm ) / eps
218 CALL
slaset(
'Full', n, n, zero, one, l, lda )
219 CALL
ssyrk(
'Upper',
'No transpose', n, n, -one, q, lda, one, l,
224 resid = slansy(
'1',
'Upper', n, l, lda, rwork )
226 result( 2 ) = ( resid /
REAL( MAX( 1, N ) ) ) / eps
subroutine slqt01(M, N, A, AF, Q, L, LDA, TAU, WORK, LWORK, RWORK, RESULT)
SLQT01
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 ssyrk(UPLO, TRANS, N, K, ALPHA, A, LDA, BETA, C, LDC)
SSYRK
subroutine sgelqf(M, N, A, LDA, TAU, WORK, LWORK, INFO)
SGELQF
subroutine slacpy(UPLO, M, N, A, LDA, B, LDB)
SLACPY copies all or part of one two-dimensional array to another.
subroutine sgemm(TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC)
SGEMM
subroutine sorglq(M, N, K, A, LDA, TAU, WORK, LWORK, INFO)
SORGLQ