home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
IRIX 6.2 Development Libraries
/
SGI IRIX 6.2 Development Libraries.iso
/
dist
/
complib.idb
/
usr
/
share
/
catman
/
p_man
/
cat3
/
complib
/
dgglse.z
/
dgglse
Wrap
Text File
|
1996-03-14
|
4KB
|
133 lines
DDDDGGGGGGGGLLLLSSSSEEEE((((3333FFFF)))) DDDDGGGGGGGGLLLLSSSSEEEE((((3333FFFF))))
NNNNAAAAMMMMEEEE
DGGLSE - solve the linear equality-constrained least squares (LSE)
problem
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE DGGLSE( M, N, P, A, LDA, B, LDB, C, D, X, WORK, LWORK, INFO )
INTEGER INFO, LDA, LDB, LWORK, M, N, P
DOUBLE PRECISION A( LDA, * ), B( LDB, * ), C( * ), D( * ),
WORK( * ), X( * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
DGGLSE solves the linear equality-constrained least squares (LSE)
problem:
minimize || c - A*x ||_2 subject to B*x = d
where A is an M-by-N matrix, B is a P-by-N matrix, c is a given M-vector,
and d is a given P-vector. It is assumed that
P <= N <= M+P, and
rank(B) = P and rank( ( A ) ) = N.
( ( B ) )
These conditions ensure that the LSE problem has a unique solution, which
is obtained using a GRQ factorization of the matrices B and A.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
M (input) INTEGER
The number of rows of the matrix A. M >= 0.
N (input) INTEGER
The number of columns of the matrices A and B. N >= 0.
P (input) INTEGER
The number of rows of the matrix B. 0 <= P <= N <= M+P.
A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
On entry, the M-by-N matrix A. On exit, A is destroyed.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,M).
B (input/output) DOUBLE PRECISION array, dimension (LDB,N)
On entry, the P-by-N matrix B. On exit, B is destroyed.
LDB (input) INTEGER
The leading dimension of the array B. LDB >= max(1,P).
PPPPaaaaggggeeee 1111
DDDDGGGGGGGGLLLLSSSSEEEE((((3333FFFF)))) DDDDGGGGGGGGLLLLSSSSEEEE((((3333FFFF))))
C (input/output) DOUBLE PRECISION array, dimension (M)
On entry, C contains the right hand side vector for the least
squares part of the LSE problem. On exit, the residual sum of
squares for the solution is given by the sum of squares of
elements N-P+1 to M of vector C.
D (input/output) DOUBLE PRECISION array, dimension (P)
On entry, D contains the right hand side vector for the
constrained equation. On exit, D is destroyed.
X (output) DOUBLE PRECISION array, dimension (N)
On exit, X is the solution of the LSE problem.
WORK (workspace/output) DOUBLE PRECISION array, dimension (LWORK)
On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
LWORK (input) INTEGER
The dimension of the array WORK. LWORK >= max(1,M+N+P). For
optimum performance LWORK >= P+min(M,N)+max(M,N)*NB, where NB is
an upper bound for the optimal blocksizes for DGEQRF, SGERQF,
DORMQR and SORMRQ.
INFO (output) INTEGER
= 0: successful exit.
< 0: if INFO = -i, the i-th argument had an illegal value.
PPPPaaaaggggeeee 2222