--- rpl/lapack/lapack/zunmlq.f 2010/08/13 21:04:17 1.6
+++ rpl/lapack/lapack/zunmlq.f 2023/08/07 08:39:44 1.20
@@ -1,10 +1,173 @@
+*> \brief \b ZUNMLQ
+*
+* =========== DOCUMENTATION ===========
+*
+* Online html documentation available at
+* http://www.netlib.org/lapack/explore-html/
+*
+*> \htmlonly
+*> Download ZUNMLQ + dependencies
+*>
+*> [TGZ]
+*>
+*> [ZIP]
+*>
+*> [TXT]
+*> \endhtmlonly
+*
+* Definition:
+* ===========
+*
+* SUBROUTINE ZUNMLQ( SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC,
+* WORK, LWORK, INFO )
+*
+* .. Scalar Arguments ..
+* CHARACTER SIDE, TRANS
+* INTEGER INFO, K, LDA, LDC, LWORK, M, N
+* ..
+* .. Array Arguments ..
+* COMPLEX*16 A( LDA, * ), C( LDC, * ), TAU( * ), WORK( * )
+* ..
+*
+*
+*> \par Purpose:
+* =============
+*>
+*> \verbatim
+*>
+*> ZUNMLQ overwrites the general complex M-by-N matrix C with
+*>
+*> SIDE = 'L' SIDE = 'R'
+*> TRANS = 'N': Q * C C * Q
+*> TRANS = 'C': Q**H * C C * Q**H
+*>
+*> where Q is a complex unitary matrix defined as the product of k
+*> elementary reflectors
+*>
+*> Q = H(k)**H . . . H(2)**H H(1)**H
+*>
+*> as returned by ZGELQF. Q is of order M if SIDE = 'L' and of order N
+*> if SIDE = 'R'.
+*> \endverbatim
+*
+* Arguments:
+* ==========
+*
+*> \param[in] SIDE
+*> \verbatim
+*> SIDE is CHARACTER*1
+*> = 'L': apply Q or Q**H from the Left;
+*> = 'R': apply Q or Q**H from the Right.
+*> \endverbatim
+*>
+*> \param[in] TRANS
+*> \verbatim
+*> TRANS is CHARACTER*1
+*> = 'N': No transpose, apply Q;
+*> = 'C': Conjugate transpose, apply Q**H.
+*> \endverbatim
+*>
+*> \param[in] M
+*> \verbatim
+*> M is INTEGER
+*> The number of rows of the matrix C. M >= 0.
+*> \endverbatim
+*>
+*> \param[in] N
+*> \verbatim
+*> N is INTEGER
+*> The number of columns of the matrix C. N >= 0.
+*> \endverbatim
+*>
+*> \param[in] K
+*> \verbatim
+*> K is INTEGER
+*> The number of elementary reflectors whose product defines
+*> the matrix Q.
+*> If SIDE = 'L', M >= K >= 0;
+*> if SIDE = 'R', N >= K >= 0.
+*> \endverbatim
+*>
+*> \param[in] A
+*> \verbatim
+*> A is COMPLEX*16 array, dimension
+*> (LDA,M) if SIDE = 'L',
+*> (LDA,N) if SIDE = 'R'
+*> The i-th row must contain the vector which defines the
+*> elementary reflector H(i), for i = 1,2,...,k, as returned by
+*> ZGELQF in the first k rows of its array argument A.
+*> \endverbatim
+*>
+*> \param[in] LDA
+*> \verbatim
+*> LDA is INTEGER
+*> The leading dimension of the array A. LDA >= max(1,K).
+*> \endverbatim
+*>
+*> \param[in] TAU
+*> \verbatim
+*> TAU is COMPLEX*16 array, dimension (K)
+*> TAU(i) must contain the scalar factor of the elementary
+*> reflector H(i), as returned by ZGELQF.
+*> \endverbatim
+*>
+*> \param[in,out] C
+*> \verbatim
+*> C is COMPLEX*16 array, dimension (LDC,N)
+*> On entry, the M-by-N matrix C.
+*> On exit, C is overwritten by Q*C or Q**H*C or C*Q**H or C*Q.
+*> \endverbatim
+*>
+*> \param[in] LDC
+*> \verbatim
+*> LDC is INTEGER
+*> The leading dimension of the array C. LDC >= max(1,M).
+*> \endverbatim
+*>
+*> \param[out] WORK
+*> \verbatim
+*> WORK is COMPLEX*16 array, dimension (MAX(1,LWORK))
+*> On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
+*> \endverbatim
+*>
+*> \param[in] LWORK
+*> \verbatim
+*> LWORK is INTEGER
+*> The dimension of the array WORK.
+*> If SIDE = 'L', LWORK >= max(1,N);
+*> if SIDE = 'R', LWORK >= max(1,M).
+*> For good performance, LWORK should generally be larger.
+*>
+*> If LWORK = -1, then a workspace query is assumed; the routine
+*> only calculates the optimal size of the WORK array, returns
+*> this value as the first entry of the WORK array, and no error
+*> message related to LWORK is issued by XERBLA.
+*> \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 complex16OTHERcomputational
+*
+* =====================================================================
SUBROUTINE ZUNMLQ( SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC,
$ WORK, LWORK, INFO )
*
-* -- LAPACK routine (version 3.2) --
+* -- LAPACK computational routine --
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-* November 2006
*
* .. Scalar Arguments ..
CHARACTER SIDE, TRANS
@@ -14,103 +177,19 @@
COMPLEX*16 A( LDA, * ), C( LDC, * ), TAU( * ), WORK( * )
* ..
*
-* Purpose
-* =======
-*
-* ZUNMLQ overwrites the general complex M-by-N matrix C with
-*
-* SIDE = 'L' SIDE = 'R'
-* TRANS = 'N': Q * C C * Q
-* TRANS = 'C': Q**H * C C * Q**H
-*
-* where Q is a complex unitary matrix defined as the product of k
-* elementary reflectors
-*
-* Q = H(k)' . . . H(2)' H(1)'
-*
-* as returned by ZGELQF. Q is of order M if SIDE = 'L' and of order N
-* if SIDE = 'R'.
-*
-* Arguments
-* =========
-*
-* SIDE (input) CHARACTER*1
-* = 'L': apply Q or Q**H from the Left;
-* = 'R': apply Q or Q**H from the Right.
-*
-* TRANS (input) CHARACTER*1
-* = 'N': No transpose, apply Q;
-* = 'C': Conjugate transpose, apply Q**H.
-*
-* M (input) INTEGER
-* The number of rows of the matrix C. M >= 0.
-*
-* N (input) INTEGER
-* The number of columns of the matrix C. N >= 0.
-*
-* K (input) INTEGER
-* The number of elementary reflectors whose product defines
-* the matrix Q.
-* If SIDE = 'L', M >= K >= 0;
-* if SIDE = 'R', N >= K >= 0.
-*
-* A (input) COMPLEX*16 array, dimension
-* (LDA,M) if SIDE = 'L',
-* (LDA,N) if SIDE = 'R'
-* The i-th row must contain the vector which defines the
-* elementary reflector H(i), for i = 1,2,...,k, as returned by
-* ZGELQF in the first k rows of its array argument A.
-* A is modified by the routine but restored on exit.
-*
-* LDA (input) INTEGER
-* The leading dimension of the array A. LDA >= max(1,K).
-*
-* TAU (input) COMPLEX*16 array, dimension (K)
-* TAU(i) must contain the scalar factor of the elementary
-* reflector H(i), as returned by ZGELQF.
-*
-* C (input/output) COMPLEX*16 array, dimension (LDC,N)
-* On entry, the M-by-N matrix C.
-* On exit, C is overwritten by Q*C or Q**H*C or C*Q**H or C*Q.
-*
-* LDC (input) INTEGER
-* The leading dimension of the array C. LDC >= max(1,M).
-*
-* WORK (workspace/output) COMPLEX*16 array, dimension (MAX(1,LWORK))
-* On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
-*
-* LWORK (input) INTEGER
-* The dimension of the array WORK.
-* If SIDE = 'L', LWORK >= max(1,N);
-* if SIDE = 'R', LWORK >= max(1,M).
-* For optimum performance LWORK >= N*NB if SIDE 'L', and
-* LWORK >= M*NB if SIDE = 'R', where NB is the optimal
-* blocksize.
-*
-* If LWORK = -1, then a workspace query is assumed; the routine
-* only calculates the optimal size of the WORK array, returns
-* this value as the first entry of the WORK array, and no error
-* message related to LWORK is issued by XERBLA.
-*
-* INFO (output) INTEGER
-* = 0: successful exit
-* < 0: if INFO = -i, the i-th argument had an illegal value
-*
* =====================================================================
*
* .. Parameters ..
- INTEGER NBMAX, LDT
- PARAMETER ( NBMAX = 64, LDT = NBMAX+1 )
+ INTEGER NBMAX, LDT, TSIZE
+ PARAMETER ( NBMAX = 64, LDT = NBMAX+1,
+ $ TSIZE = LDT*NBMAX )
* ..
* .. Local Scalars ..
LOGICAL LEFT, LQUERY, NOTRAN
CHARACTER TRANST
- INTEGER I, I1, I2, I3, IB, IC, IINFO, IWS, JC, LDWORK,
+ INTEGER I, I1, I2, I3, IB, IC, IINFO, IWT, JC, LDWORK,
$ LWKOPT, MI, NB, NBMIN, NI, NQ, NW
* ..
-* .. Local Arrays ..
- COMPLEX*16 T( LDT, NBMAX )
-* ..
* .. External Functions ..
LOGICAL LSAME
INTEGER ILAENV
@@ -135,10 +214,10 @@
*
IF( LEFT ) THEN
NQ = M
- NW = N
+ NW = MAX( 1, N )
ELSE
NQ = N
- NW = M
+ NW = MAX( 1, M )
END IF
IF( .NOT.LEFT .AND. .NOT.LSAME( SIDE, 'R' ) ) THEN
INFO = -1
@@ -154,18 +233,17 @@
INFO = -7
ELSE IF( LDC.LT.MAX( 1, M ) ) THEN
INFO = -10
- ELSE IF( LWORK.LT.MAX( 1, NW ) .AND. .NOT.LQUERY ) THEN
+ ELSE IF( LWORK.LT.NW .AND. .NOT.LQUERY ) THEN
INFO = -12
END IF
*
IF( INFO.EQ.0 ) THEN
*
-* Determine the block size. NB may be at most NBMAX, where NBMAX
-* is used to define the local array T.
+* Compute the workspace requirements
*
NB = MIN( NBMAX, ILAENV( 1, 'ZUNMLQ', SIDE // TRANS, M, N, K,
$ -1 ) )
- LWKOPT = MAX( 1, NW )*NB
+ LWKOPT = NW*NB + TSIZE
WORK( 1 ) = LWKOPT
END IF
*
@@ -186,14 +264,11 @@
NBMIN = 2
LDWORK = NW
IF( NB.GT.1 .AND. NB.LT.K ) THEN
- IWS = NW*NB
- IF( LWORK.LT.IWS ) THEN
- NB = LWORK / LDWORK
+ IF( LWORK.LT.LWKOPT ) THEN
+ NB = (LWORK-TSIZE) / LDWORK
NBMIN = MAX( 2, ILAENV( 2, 'ZUNMLQ', SIDE // TRANS, M, N, K,
$ -1 ) )
END IF
- ELSE
- IWS = NW
END IF
*
IF( NB.LT.NBMIN .OR. NB.GE.K ) THEN
@@ -206,6 +281,7 @@
*
* Use blocked code
*
+ IWT = 1 + NW*NB
IF( ( LEFT .AND. NOTRAN ) .OR.
$ ( .NOT.LEFT .AND. .NOT.NOTRAN ) ) THEN
I1 = 1
@@ -238,26 +314,26 @@
* H = H(i) H(i+1) . . . H(i+ib-1)
*
CALL ZLARFT( 'Forward', 'Rowwise', NQ-I+1, IB, A( I, I ),
- $ LDA, TAU( I ), T, LDT )
+ $ LDA, TAU( I ), WORK( IWT ), LDT )
IF( LEFT ) THEN
*
-* H or H' is applied to C(i:m,1:n)
+* H or H**H is applied to C(i:m,1:n)
*
MI = M - I + 1
IC = I
ELSE
*
-* H or H' is applied to C(1:m,i:n)
+* H or H**H is applied to C(1:m,i:n)
*
NI = N - I + 1
JC = I
END IF
*
-* Apply H or H'
+* Apply H or H**H
*
CALL ZLARFB( SIDE, TRANST, 'Forward', 'Rowwise', MI, NI, IB,
- $ A( I, I ), LDA, T, LDT, C( IC, JC ), LDC, WORK,
- $ LDWORK )
+ $ A( I, I ), LDA, WORK( IWT ), LDT,
+ $ C( IC, JC ), LDC, WORK, LDWORK )
10 CONTINUE
END IF
WORK( 1 ) = LWKOPT