--- rpl/lapack/lapack/zgeqpf.f 2010/12/21 13:53:43 1.8 +++ rpl/lapack/lapack/zgeqpf.f 2023/08/07 08:39:18 1.19 @@ -1,9 +1,154 @@ +*> \brief \b ZGEQPF +* +* =========== DOCUMENTATION =========== +* +* Online html documentation available at +* http://www.netlib.org/lapack/explore-html/ +* +*> \htmlonly +*> Download ZGEQPF + dependencies +*> +*> [TGZ] +*> +*> [ZIP] +*> +*> [TXT] +*> \endhtmlonly +* +* Definition: +* =========== +* +* SUBROUTINE ZGEQPF( M, N, A, LDA, JPVT, TAU, WORK, RWORK, INFO ) +* +* .. Scalar Arguments .. +* INTEGER INFO, LDA, M, N +* .. +* .. Array Arguments .. +* INTEGER JPVT( * ) +* DOUBLE PRECISION RWORK( * ) +* COMPLEX*16 A( LDA, * ), TAU( * ), WORK( * ) +* .. +* +* +*> \par Purpose: +* ============= +*> +*> \verbatim +*> +*> This routine is deprecated and has been replaced by routine ZGEQP3. +*> +*> ZGEQPF computes a QR factorization with column pivoting of a +*> complex M-by-N matrix A: A*P = Q*R. +*> \endverbatim +* +* Arguments: +* ========== +* +*> \param[in] M +*> \verbatim +*> M is INTEGER +*> The number of rows of the matrix A. M >= 0. +*> \endverbatim +*> +*> \param[in] N +*> \verbatim +*> N is INTEGER +*> The number of columns of the matrix A. N >= 0 +*> \endverbatim +*> +*> \param[in,out] A +*> \verbatim +*> A is COMPLEX*16 array, dimension (LDA,N) +*> On entry, the M-by-N matrix A. +*> On exit, the upper triangle of the array contains the +*> min(M,N)-by-N upper triangular matrix R; the elements +*> below the diagonal, together with the array TAU, +*> represent the unitary matrix Q as a product of +*> min(m,n) elementary reflectors. +*> \endverbatim +*> +*> \param[in] LDA +*> \verbatim +*> LDA is INTEGER +*> The leading dimension of the array A. LDA >= max(1,M). +*> \endverbatim +*> +*> \param[in,out] JPVT +*> \verbatim +*> JPVT is INTEGER array, dimension (N) +*> On entry, if JPVT(i) .ne. 0, the i-th column of A is permuted +*> to the front of A*P (a leading column); if JPVT(i) = 0, +*> the i-th column of A is a free column. +*> On exit, if JPVT(i) = k, then the i-th column of A*P +*> was the k-th column of A. +*> \endverbatim +*> +*> \param[out] TAU +*> \verbatim +*> TAU is COMPLEX*16 array, dimension (min(M,N)) +*> The scalar factors of the elementary reflectors. +*> \endverbatim +*> +*> \param[out] WORK +*> \verbatim +*> WORK is COMPLEX*16 array, dimension (N) +*> \endverbatim +*> +*> \param[out] RWORK +*> \verbatim +*> RWORK is DOUBLE PRECISION array, dimension (2*N) +*> \endverbatim +*> +*> \param[out] INFO +*> \verbatim +*> INFO is INTEGER +*> = 0: successful exit +*> < 0: if INFO = -i, the i-th argument had an illegal value +*> \endverbatim +* +* Authors: +* ======== +* +*> \author Univ. of Tennessee +*> \author Univ. of California Berkeley +*> \author Univ. of Colorado Denver +*> \author NAG Ltd. +* +*> \ingroup complex16GEcomputational +* +*> \par Further Details: +* ===================== +*> +*> \verbatim +*> +*> The matrix Q is represented as a product of elementary reflectors +*> +*> Q = H(1) H(2) . . . H(n) +*> +*> Each H(i) has the form +*> +*> H = I - tau * v * v**H +*> +*> where tau is a complex scalar, and v is a complex vector with +*> v(1:i-1) = 0 and v(i) = 1; v(i+1:m) is stored on exit in A(i+1:m,i). +*> +*> The matrix P is represented in jpvt as follows: If +*> jpvt(j) = i +*> then the jth column of P is the ith canonical unit vector. +*> +*> Partial column norm updating strategy modified by +*> Z. Drmac and Z. Bujanovic, Dept. of Mathematics, +*> University of Zagreb, Croatia. +*> -- April 2011 -- +*> For more details see LAPACK Working Note 176. +*> \endverbatim +*> +* ===================================================================== SUBROUTINE ZGEQPF( M, N, A, LDA, JPVT, TAU, WORK, RWORK, INFO ) * -* -- LAPACK deprecated computational routine (version 3.2.2) -- +* -- LAPACK computational routine -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- -* June 2010 * * .. Scalar Arguments .. INTEGER INFO, LDA, M, N @@ -14,76 +159,6 @@ COMPLEX*16 A( LDA, * ), TAU( * ), WORK( * ) * .. * -* Purpose -* ======= -* -* This routine is deprecated and has been replaced by routine ZGEQP3. -* -* ZGEQPF computes a QR factorization with column pivoting of a -* complex M-by-N matrix A: A*P = Q*R. -* -* 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) COMPLEX*16 array, dimension (LDA,N) -* On entry, the M-by-N matrix A. -* On exit, the upper triangle of the array contains the -* min(M,N)-by-N upper triangular matrix R; the elements -* below the diagonal, together with the array TAU, -* represent the unitary matrix Q as a product of -* min(m,n) elementary reflectors. -* -* LDA (input) INTEGER -* The leading dimension of the array A. LDA >= max(1,M). -* -* JPVT (input/output) INTEGER array, dimension (N) -* On entry, if JPVT(i) .ne. 0, the i-th column of A is permuted -* to the front of A*P (a leading column); if JPVT(i) = 0, -* the i-th column of A is a free column. -* On exit, if JPVT(i) = k, then the i-th column of A*P -* was the k-th column of A. -* -* TAU (output) COMPLEX*16 array, dimension (min(M,N)) -* The scalar factors of the elementary reflectors. -* -* WORK (workspace) COMPLEX*16 array, dimension (N) -* -* RWORK (workspace) DOUBLE PRECISION array, dimension (2*N) -* -* 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(1) H(2) . . . H(n) -* -* Each H(i) has the form -* -* H = I - tau * v * v' -* -* where tau is a complex scalar, and v is a complex vector with -* v(1:i-1) = 0 and v(i) = 1; v(i+1:m) is stored on exit in A(i+1:m,i). -* -* The matrix P is represented in jpvt as follows: If -* jpvt(j) = i -* then the jth column of P is the ith canonical unit vector. -* -* Partial column norm updating strategy modified by -* Z. Drmac and Z. Bujanovic, Dept. of Mathematics, -* University of Zagreb, Croatia. -* June 2010 -* For more details see LAPACK Working Note 176. -* * ===================================================================== * * .. Parameters .. @@ -208,11 +283,11 @@ * * NOTE: The following 4 lines follow from the analysis in * Lapack Working Note 176. -* +* TEMP = ABS( A( I, J ) ) / RWORK( J ) TEMP = MAX( ZERO, ( ONE+TEMP )*( ONE-TEMP ) ) TEMP2 = TEMP*( RWORK( J ) / RWORK( N+J ) )**2 - IF( TEMP2 .LE. TOL3Z ) THEN + IF( TEMP2 .LE. TOL3Z ) THEN IF( M-I.GT.0 ) THEN RWORK( J ) = DZNRM2( M-I, A( I+1, J ), 1 ) RWORK( N+J ) = RWORK( J )