NAME

SYNOPSIS

  SUBROUTINE DTPTRS( UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO)
  CHARACTER * 1 UPLO, TRANSA, DIAG
  INTEGER N, NRHS, LDB, INFO
  DOUBLE PRECISION A(*), B(LDB,*)
 
  SUBROUTINE DTPTRS_64( UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO)
  CHARACTER * 1 UPLO, TRANSA, DIAG
  INTEGER*8 N, NRHS, LDB, INFO
  DOUBLE PRECISION A(*), B(LDB,*)
 

F95 INTERFACE

  SUBROUTINE TPTRS( UPLO, TRANSA, DIAG, N, NRHS, A, B, [LDB], [INFO])
  CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG
  INTEGER :: N, NRHS, LDB, INFO
  REAL(8), DIMENSION(:) :: A
  REAL(8), DIMENSION(:,:) :: B
 
  SUBROUTINE TPTRS_64( UPLO, TRANSA, DIAG, N, NRHS, A, B, [LDB], [INFO])
  CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG
  INTEGER(8) :: N, NRHS, LDB, INFO
  REAL(8), DIMENSION(:) :: A
  REAL(8), DIMENSION(:,:) :: B
 

C INTERFACE

void dtptrs(char uplo, char transa, char diag, int n, int nrhs, double *a, double *b, int ldb, int *info);

void dtptrs_64(char uplo, char transa, char diag, long n, long nrhs, double *a, double *b, long ldb, long *info);

PURPOSE

where A is a triangular matrix of order N stored in packed format, and B is an N-by-NRHS matrix. A check is made to verify that A is nonsingular.

ARGUMENTS

* UPLO (input)

* TRANSA (input)

Specifies the form of the system of equations:

* DIAG (input)

* N (input)

The order of the matrix A. N >= 0.

* NRHS (input)

The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.

* A (input)

The upper or lower triangular matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array A as follows: if UPLO = 'U', A(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L', A(i + (j-1)*(2*n-j)/2) = A(i,j) for j<=i<=n.

* B (input/output)

On entry, the right hand side matrix B. On exit, if INFO = 0, the solution matrix X.

* LDB (input)

The leading dimension of the array B. LDB >= max(1,N).

* INFO (output)