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/* ---------------------------------------------------------------------
*
* -- PBLAS auxiliary routine (version 2.0) --
* University of Tennessee, Knoxville, Oak Ridge National Laboratory,
* and University of California, Berkeley.
* April 1, 1998
*
* ---------------------------------------------------------------------
*/
/*
* Include files
*/
#include "../pblas.h"
#include "../PBpblas.h"
#include "../PBtools.h"
#include "../PBblacs.h"
#include "../PBblas.h"
#ifdef __STDC__
void PB_Ctztrmv( PBTYP_T * TYPE, char * SIDE, char * UPLO, char * TRANS,
char * DIAG, int M, int N, int K, int IOFFD,
char * ALPHA, char * A, int LDA, char * X, int LDX,
char * Y, int LDY )
#else
void PB_Ctztrmv( TYPE, SIDE, UPLO, TRANS, DIAG, M, N, K, IOFFD, ALPHA,
A, LDA, X, LDX, Y, LDY )
/*
* .. Scalar Arguments ..
*/
char * SIDE, * UPLO, * TRANS, * DIAG;
int IOFFD, K, LDA, LDX, LDY, M, N;
char * ALPHA;
/*
* .. Array Arguments ..
*/
char * A, * X, * Y;
PBTYP_T * TYPE;
#endif
{
/*
* Purpose
* =======
*
* PB_Ctztrmv performs the matrix-vector operation
*
* y := A * x, or y := A' * x, or y := conjg( A' ) * x,
*
* where alpha and beta are scalars, x and y are vectors, and A is an
* m by n trapezoidal triangular matrix.
*
* Arguments
* =========
*
* TYPE (local input) pointer to a PBTYP_T structure
* On entry, TYPE is a pointer to a structure of type PBTYP_T,
* that contains type information (See pblas.h).
*
* SIDE (dummy) pointer to CHAR
* In this routine, SIDE is a dummy (unused) argument.
*
* UPLO (input) pointer to CHAR
* On entry, UPLO specifies which part of the matrix A is to be
* referenced as follows:
*
* UPLO = 'L' or 'l' the lower trapezoid of A is referenced,
*
* UPLO = 'U' or 'u' the upper trapezoid of A is referenced,
*
* otherwise all of the matrix A is referenced.
*
* TRANS (input) pointer to CHAR
* On entry, TRANS specifies the operation to be performed as
* follows:
*
* TRANS = 'N' or 'n': y := A*x,
*
* TRANS = 'T' or 't': y := A'*x,
*
* TRANS = 'C' or 'c': y := A'*x or y := conjg( A' )*x.
*
* DIAG (input) pointer to CHAR
* On entry, DIAG specifies whether or not A is unit triangular
* as follows:
*
* DIAG = 'U' or 'u' A is assumed to be unit triangular.
*
* DIAG = 'N' or 'n' A is not assumed to be unit triangular.
*
* M (input) INTEGER
* On entry, M specifies the number of rows of the matrix A. M
* must be at least zero.
*
* N (input) INTEGER
* On entry, N specifies the number of columns of the matrix A.
* N must be at least zero.
*
* K (dummy) INTEGER
* In this routine, K is a dummy (unused) argument.
*
* IOFFD (input) INTEGER
* On entry, IOFFD specifies the position of the offdiagonal de-
* limiting the upper and lower trapezoidal part of A as follows
* (see the notes below):
*
* IOFFD = 0 specifies the main diagonal A( i, i ),
* with i = 1 ... MIN( M, N ),
* IOFFD > 0 specifies the subdiagonal A( i+IOFFD, i ),
* with i = 1 ... MIN( M-IOFFD, N ),
* IOFFD < 0 specifies the superdiagonal A( i, i-IOFFD ),
* with i = 1 ... MIN( M, N+IOFFD ).
*
* ALPHA (dummy) pointer to CHAR
* In this routine, ALPHA is a dummy (unused) argument.
*
* A (input) pointer to CHAR
* On entry, A is an array of dimension (LDA,N) containing the m
* by n matrix A. Only the trapezoidal part of A determined by
* UPLO and IOFFD is referenced. When DIAG = 'U' or 'u', the
* diagonal elements of A are not referenced either, but are
* assumed to be unity.
*
* LDA (input) INTEGER
* On entry, LDA specifies the leading dimension of the array A.
* LDA must be at least max( 1, M ).
*
* X (input) pointer to CHAR
* On entry, X is an array of dimension (LDX,Kx). Before entry,
* with TRANS = 'N' or 'n', the array X must contain the n ele-
* ment vector x corresponding to the columns of A. Otherwise,
* the array X must contain the m element vector x corresponding
* to the rows of A. When TRANS is 'N' or 'n', LDX is at least
* 1, and Kx is at least N. Otherwise, LDX is at least max(1,M),
* and Kx is at least 1.
*
* LDX (input) INTEGER
* On entry, LDX specifies the leading dimension of the array X.
* LDX must be at least 1 when TRANS is 'N' or 'n' and
* max( 1, M ) otherwise.
*
* Y (input/output) pointer to CHAR
* On entry, Y is an array of dimension (LDY,Ky). On exit, with
* TRANS = 'N' or 'n', the array Y contains the m element vector
* y corresponding to the rows of A. Otherwise, the array Y con-
* tains the n element vector y corresponding to the columns of
* A. When TRANS is 'N' or 'n', LDY is at least max( 1, M ), and
* Ky is at least 1. Otherwise, LDY is at least 1, and Ky is at
* least N. On exit, Y is overwritten by the partial updated
* vector y.
*
* LDY (input) INTEGER
* On entry, LDY specifies the leading dimension of the array Y.
* LDY must be at least max( 1, M ) when TRANS is 'N' or
* 'n' and 1 otherwise.
*
* Notes
* =====
* N N
* ---------------------------- -----------
* | d | | |
* M | d Upper | | Upper |
* | Lower d | |d |
* | d | M | d |
* ---------------------------- | d |
* | d |
* IOFFD < 0 | Lower d |
* | d|
* N | |
* ----------- -----------
* | d Upper|
* | d | IOFFD > 0
* M | d |
* | d| N
* | Lower | ----------------------------
* | | | Upper |
* | | |d |
* | | | d |
* | | | d |
* | | |Lower d |
* ----------- ----------------------------
*
* -- Written on April 1, 1998 by
* Antoine Petitet, University of Tennessee, Knoxville 37996, USA.
*
* ---------------------------------------------------------------------
*/
/*
* .. Local Scalars ..
*/
int ione = 1;
char * Aptr = NULL;
/* ..
* .. Executable Statements ..
*
*/
if( ( M <= 0 ) || ( N <= 0 ) ) return;
if( ( Mupcase( UPLO[0] ) == CLOWER ) || ( Mupcase( UPLO[0] ) == CUPPER ) )
{
Aptr = PB_Cmalloc( M * N * TYPE->size );
TYPE->Ftzpadcpy( C2F_CHAR( UPLO ), C2F_CHAR( DIAG ), &M, &N, &IOFFD,
A, &LDA, Aptr, &M );
if( Mupcase( TRANS[0] ) == CNOTRAN )
{
TYPE->Fgemv( C2F_CHAR( TRANS ), &M, &N, ALPHA, Aptr, &M, X, &LDX,
TYPE->one, Y, &ione );
}
else
{
TYPE->Fgemv( C2F_CHAR( TRANS ), &M, &N, ALPHA, Aptr, &M, X, &ione,
TYPE->one, Y, &LDY );
}
if( Aptr ) free( Aptr );
}
else
{
if( Mupcase( TRANS[0] ) == CNOTRAN )
{
TYPE->Fgemv( C2F_CHAR( TRANS ), &M, &N, ALPHA, A, &LDA, X, &LDX,
TYPE->one, Y, &ione );
}
else
{
TYPE->Fgemv( C2F_CHAR( TRANS ), &M, &N, ALPHA, A, &LDA, X, &ione,
TYPE->one, Y, &LDY );
}
}
/*
* End of PB_Ctztrmv
*/
}
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