

ORDER (local input) const enum HPL_ORDER  
On entry, ORDER specifies the storage format of the operands
as follows:
ORDER = HplRowMajor, ORDER = HplColumnMajor.  
UPLO (local input) const enum HPL_UPLO  
On entry, UPLO specifies whether the upper or lower triangular part of the array A is to be referenced. When UPLO==HplUpper, only the upper triangular part of A is to be referenced, otherwise only the lower triangular part of A is to be referenced.  
TRANS (local input) const enum HPL_TRANS  
On entry, TRANS specifies the equations to be solved as
follows:
TRANS==HplNoTrans A * x = b, TRANS==HplTrans A^T * x = b.  
DIAG (local input) const enum HPL_DIAG  
On entry, DIAG specifies whether A is unit triangular or not. When DIAG==HplUnit, A is assumed to be unit triangular, and otherwise, A is not assumed to be unit triangular.  
N (local input) const int  
On entry, N specifies the order of the matrix A. N must be at least zero.  
A (local input) const double *  
On entry, A points to an array of size equal to or greater
than LDA * n. Before entry with UPLO==HplUpper, the leading
n by n upper triangular part of the array A must contain the
upper triangular matrix and the strictly lower triangular
part of A is not referenced. When UPLO==HplLower on entry,
the leading n by n lower triangular part of the array A must
contain the lower triangular matrix and the strictly upper
triangular part of A is not referenced.
Note that when DIAG==HplUnit, the diagonal elements of A not referenced either, but are assumed to be unity.  
LDA (local input) const int  
On entry, LDA specifies the leading dimension of A as declared in the calling (sub) program. LDA must be at least MAX(1,n).  
X (local input/output) double *  
On entry, X is an incremented array of dimension at least ( 1 + ( n  1 ) * abs( INCX ) ) that contains the vector x. Before entry, the incremented array X must contain the n element righthand side vector b. On exit, X is overwritten with the solution vector x.  
INCX (local input) const int  
On entry, INCX specifies the increment for the elements of X. INCX must not be zero.  
#include "hpl.h"int main(int argc, char *argv[])
{
double a[2*2], x[2];
a[0] = 4.0; a[1] = 1.0; a[2] = 2.0; a[3] = 5.0;
x[0] = 2.0; x[1] = 1.0;
HPL_dtrsv( HplColumnMajor, HplLower, HplNoTrans,
HplNoUnit, a, 2, x, 1 );
printf("x=[%f,%f]\n", x[0], x[1]);
exit(0); return(0);
}
HPL_dger (3), HPL_dgemv (3).
HPL 2.1  HPL_DTRSV (3)  October 26, 2012 
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