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author | jofret | 2009-04-28 07:17:00 +0000 |
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committer | jofret | 2009-04-28 07:17:00 +0000 |
commit | 8c8d2f518968ce7057eec6aa5cd5aec8faab861a (patch) | |
tree | 3dd1788b71d6a3ce2b73d2d475a3133580e17530 /src/lib/lapack/dgelq2.f | |
parent | 9f652ffc16a310ac6641a9766c5b9e2671e0e9cb (diff) | |
download | scilab2c-8c8d2f518968ce7057eec6aa5cd5aec8faab861a.tar.gz scilab2c-8c8d2f518968ce7057eec6aa5cd5aec8faab861a.tar.bz2 scilab2c-8c8d2f518968ce7057eec6aa5cd5aec8faab861a.zip |
Moving lapack to right place
Diffstat (limited to 'src/lib/lapack/dgelq2.f')
-rw-r--r-- | src/lib/lapack/dgelq2.f | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/src/lib/lapack/dgelq2.f b/src/lib/lapack/dgelq2.f deleted file mode 100644 index f3540505..00000000 --- a/src/lib/lapack/dgelq2.f +++ /dev/null @@ -1,121 +0,0 @@ - SUBROUTINE DGELQ2( M, N, A, LDA, TAU, WORK, INFO ) -* -* -- LAPACK routine (version 3.1) -- -* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. -* November 2006 -* -* .. Scalar Arguments .. - INTEGER INFO, LDA, M, N -* .. -* .. Array Arguments .. - DOUBLE PRECISION A( LDA, * ), TAU( * ), WORK( * ) -* .. -* -* Purpose -* ======= -* -* DGELQ2 computes an LQ factorization of a real m by n matrix A: -* A = L * Q. -* -* Arguments -* ========= -* -* M (input) INTEGER -* The number of rows of the matrix A. M >= 0. -* -* N (input) INTEGER -* The number of columns of the matrix A. N >= 0. -* -* A (input/output) DOUBLE PRECISION array, dimension (LDA,N) -* On entry, the m by n matrix A. -* On exit, the elements on and below the diagonal of the array -* contain the m by min(m,n) lower trapezoidal matrix L (L is -* lower triangular if m <= n); the elements above the diagonal, -* with the array TAU, represent the orthogonal matrix Q as a -* product of elementary reflectors (see Further Details). -* -* LDA (input) INTEGER -* The leading dimension of the array A. LDA >= max(1,M). -* -* TAU (output) DOUBLE PRECISION array, dimension (min(M,N)) -* The scalar factors of the elementary reflectors (see Further -* Details). -* -* WORK (workspace) DOUBLE PRECISION array, dimension (M) -* -* INFO (output) INTEGER -* = 0: successful exit -* < 0: if INFO = -i, the i-th argument had an illegal value -* -* Further Details -* =============== -* -* The matrix Q is represented as a product of elementary reflectors -* -* Q = H(k) . . . H(2) H(1), where k = min(m,n). -* -* Each H(i) has the form -* -* H(i) = I - tau * v * v' -* -* where tau is a real scalar, and v is a real vector with -* v(1:i-1) = 0 and v(i) = 1; v(i+1:n) is stored on exit in A(i,i+1:n), -* and tau in TAU(i). -* -* ===================================================================== -* -* .. Parameters .. - DOUBLE PRECISION ONE - PARAMETER ( ONE = 1.0D+0 ) -* .. -* .. Local Scalars .. - INTEGER I, K - DOUBLE PRECISION AII -* .. -* .. External Subroutines .. - EXTERNAL DLARF, DLARFG, XERBLA -* .. -* .. Intrinsic Functions .. - INTRINSIC MAX, MIN -* .. -* .. Executable Statements .. -* -* Test the input arguments -* - INFO = 0 - IF( M.LT.0 ) THEN - INFO = -1 - ELSE IF( N.LT.0 ) THEN - INFO = -2 - ELSE IF( LDA.LT.MAX( 1, M ) ) THEN - INFO = -4 - END IF - IF( INFO.NE.0 ) THEN - CALL XERBLA( 'DGELQ2', -INFO ) - RETURN - END IF -* - K = MIN( M, N ) -* - DO 10 I = 1, K -* -* Generate elementary reflector H(i) to annihilate A(i,i+1:n) -* - CALL DLARFG( N-I+1, A( I, I ), A( I, MIN( I+1, N ) ), LDA, - $ TAU( I ) ) - IF( I.LT.M ) THEN -* -* Apply H(i) to A(i+1:m,i:n) from the right -* - AII = A( I, I ) - A( I, I ) = ONE - CALL DLARF( 'Right', M-I, N-I+1, A( I, I ), LDA, TAU( I ), - $ A( I+1, I ), LDA, WORK ) - A( I, I ) = AII - END IF - 10 CONTINUE - RETURN -* -* End of DGELQ2 -* - END |