 LAPACK 3.11.0 LAPACK: Linear Algebra PACKage
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## ◆ sglmts()

 subroutine sglmts ( integer N, integer M, integer P, real, dimension( lda, * ) A, real, dimension( lda, * ) AF, integer LDA, real, dimension( ldb, * ) B, real, dimension( ldb, * ) BF, integer LDB, real, dimension( * ) D, real, dimension( * ) DF, real, dimension( * ) X, real, dimension( * ) U, real, dimension( lwork ) WORK, integer LWORK, real, dimension( * ) RWORK, real RESULT )

SGLMTS

Purpose:
``` SGLMTS tests SGGGLM - a subroutine for solving the generalized
linear model problem.```
Parameters
 [in] N ``` N is INTEGER The number of rows of the matrices A and B. N >= 0.``` [in] M ``` M is INTEGER The number of columns of the matrix A. M >= 0.``` [in] P ``` P is INTEGER The number of columns of the matrix B. P >= 0.``` [in] A ``` A is REAL array, dimension (LDA,M) The N-by-M matrix A.``` [out] AF ` AF is REAL array, dimension (LDA,M)` [in] LDA ``` LDA is INTEGER The leading dimension of the arrays A, AF. LDA >= max(M,N).``` [in] B ``` B is REAL array, dimension (LDB,P) The N-by-P matrix A.``` [out] BF ` BF is REAL array, dimension (LDB,P)` [in] LDB ``` LDB is INTEGER The leading dimension of the arrays B, BF. LDB >= max(P,N).``` [in] D ``` D is REAL array, dimension( N ) On input, the left hand side of the GLM.``` [out] DF ` DF is REAL array, dimension( N )` [out] X ``` X is REAL array, dimension( M ) solution vector X in the GLM problem.``` [out] U ``` U is REAL array, dimension( P ) solution vector U in the GLM problem.``` [out] WORK ` WORK is REAL array, dimension (LWORK)` [in] LWORK ``` LWORK is INTEGER The dimension of the array WORK.``` [out] RWORK ` RWORK is REAL array, dimension (M)` [out] RESULT ``` RESULT is REAL The test ratio: norm( d - A*x - B*u ) RESULT = ----------------------------------------- (norm(A)+norm(B))*(norm(x)+norm(u))*EPS```

Definition at line 147 of file sglmts.f.

149*
150* -- LAPACK test routine --
151* -- LAPACK is a software package provided by Univ. of Tennessee, --
152* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
153*
154* .. Scalar Arguments ..
155 INTEGER LDA, LDB, LWORK, M, P, N
156 REAL RESULT
157* ..
158* .. Array Arguments ..
159 REAL A( LDA, * ), AF( LDA, * ), B( LDB, * ),
160 \$ BF( LDB, * ), RWORK( * ), D( * ), DF( * ),
161 \$ U( * ), WORK( LWORK ), X( * )
162*
163* ====================================================================
164*
165* .. Parameters ..
166 REAL ZERO, ONE
167 parameter( zero = 0.0e+0, one = 1.0e+0 )
168* ..
169* .. Local Scalars ..
170 INTEGER INFO
171 REAL ANORM, BNORM, EPS, XNORM, YNORM, DNORM, UNFL
172* ..
173* .. External Functions ..
174 REAL SASUM, SLAMCH, SLANGE
175 EXTERNAL sasum, slamch, slange
176* ..
177* .. External Subroutines ..
178 EXTERNAL slacpy
179*
180* .. Intrinsic Functions ..
181 INTRINSIC max
182* ..
183* .. Executable Statements ..
184*
185 eps = slamch( 'Epsilon' )
186 unfl = slamch( 'Safe minimum' )
187 anorm = max( slange( '1', n, m, a, lda, rwork ), unfl )
188 bnorm = max( slange( '1', n, p, b, ldb, rwork ), unfl )
189*
190* Copy the matrices A and B to the arrays AF and BF,
191* and the vector D the array DF.
192*
193 CALL slacpy( 'Full', n, m, a, lda, af, lda )
194 CALL slacpy( 'Full', n, p, b, ldb, bf, ldb )
195 CALL scopy( n, d, 1, df, 1 )
196*
197* Solve GLM problem
198*
199 CALL sggglm( n, m, p, af, lda, bf, ldb, df, x, u, work, lwork,
200 \$ info )
201*
202* Test the residual for the solution of LSE
203*
204* norm( d - A*x - B*u )
205* RESULT = -----------------------------------------
206* (norm(A)+norm(B))*(norm(x)+norm(u))*EPS
207*
208 CALL scopy( n, d, 1, df, 1 )
209 CALL sgemv( 'No transpose', n, m, -one, a, lda, x, 1,
210 \$ one, df, 1 )
211*
212 CALL sgemv( 'No transpose', n, p, -one, b, ldb, u, 1,
213 \$ one, df, 1 )
214*
215 dnorm = sasum( n, df, 1 )
216 xnorm = sasum( m, x, 1 ) + sasum( p, u, 1 )
217 ynorm = anorm + bnorm
218*
219 IF( xnorm.LE.zero ) THEN
220 result = zero
221 ELSE
222 result = ( ( dnorm / ynorm ) / xnorm ) /eps
223 END IF
224*
225 RETURN
226*
227* End of SGLMTS
228*
subroutine slacpy(UPLO, M, N, A, LDA, B, LDB)
SLACPY copies all or part of one two-dimensional array to another.
Definition: slacpy.f:103
real function slange(NORM, M, N, A, LDA, WORK)
SLANGE returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value ...
Definition: slange.f:114
subroutine sggglm(N, M, P, A, LDA, B, LDB, D, X, Y, WORK, LWORK, INFO)
SGGGLM
Definition: sggglm.f:185
subroutine scopy(N, SX, INCX, SY, INCY)
SCOPY
Definition: scopy.f:82
real function sasum(N, SX, INCX)
SASUM
Definition: sasum.f:72
subroutine sgemv(TRANS, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
SGEMV
Definition: sgemv.f:156
real function slamch(CMACH)
SLAMCH
Definition: slamch.f:68
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