redhat man page for dpptrs

DPPTRS(l)								 )								 DPPTRS(l)

NAME
       DPPTRS  -  solve a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky fac-
       torization A = U**T*U or A = L*L**T computed by DPPTRF

SYNOPSIS
       SUBROUTINE DPPTRS( UPLO, N, NRHS, AP, B, LDB, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDB, N, NRHS

	   DOUBLE	  PRECISION AP( * ), B( LDB, * )

PURPOSE
       DPPTRS solves a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky factor-
       ization A = U**T*U or A = L*L**T computed by DPPTRF.

ARGUMENTS
       UPLO    (input) CHARACTER*1
	       = 'U':  Upper triangle of A is stored;
	       = 'L':  Lower triangle of A is stored.

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

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

       AP      (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
	       The triangular factor U or L from the Cholesky factorization A = U**T*U or A = L*L**T, packed columnwise in a linear array.  The j-
	       th column of U or L is stored in the array AP as follows: if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;  if  UPLO  =  'L',
	       AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

       B       (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	       On entry, the right hand side matrix B.	On exit, the solution matrix X.

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

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value

LAPACK version 3.0						   15 June 2000 							 DPPTRS(l)