dsptrs (l)  Linux Man Pages
dsptrs: solves a system of linear equations A*X = B with a real symmetric matrix A stored in packed format using the factorization A = U*D*U**T or A = L*D*L**T computed by DSPTRF
Command to display dsptrs
manual in Linux: $ man l dsptrs
NAME
DSPTRS  solves a system of linear equations A*X = B with a real symmetric matrix A stored in packed format using the factorization A = U*D*U**T or A = L*D*L**T computed by DSPTRF
SYNOPSIS
 SUBROUTINE DSPTRS(

UPLO, N, NRHS, AP, IPIV, B, LDB, INFO )

CHARACTER
UPLO

INTEGER
INFO, LDB, N, NRHS

INTEGER
IPIV( * )

DOUBLE
PRECISION AP( * ), B( LDB, * )
PURPOSE
DSPTRS solves a system of linear equations A*X = B with a real
symmetric matrix A stored in packed format using the factorization
A = U*D*U**T or A = L*D*L**T computed by DSPTRF.
ARGUMENTS
 UPLO (input) CHARACTER*1

Specifies whether the details of the factorization are stored
as an upper or lower triangular matrix.
= aqUaq: Upper triangular, form is A = U*D*U**T;
= aqLaq: Lower triangular, form is A = L*D*L**T.
 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 block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by DSPTRF, stored as a
packed triangular matrix.
 IPIV (input) INTEGER array, dimension (N)

Details of the interchanges and the block structure of D
as determined by DSPTRF.
 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 ith argument had an illegal value
Pages related to dsptrs
 dsptrs (3)
 dsptrd (l)  reduces a real symmetric matrix A stored in packed form to symmetric tridiagonal form T by an orthogonal similarity transformation
 dsptrf (l)  computes the factorization of a real symmetric matrix A stored in packed format using the BunchKaufman diagonal pivoting method
 dsptri (l)  computes the inverse of a real symmetric indefinite matrix A in packed storage using the factorization A = U*D*U**T or A = L*D*L**T computed by DSPTRF
 dspcon (l)  estimates the reciprocal of the condition number (in the 1norm) of a real symmetric packed matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by DSPTRF
 dspev (l)  computes all the eigenvalues and, optionally, eigenvectors of a real symmetric matrix A in packed storage
 dspevd (l)  computes all the eigenvalues and, optionally, eigenvectors of a real symmetric matrix A in packed storage
 dspevx (l)  computes selected eigenvalues and, optionally, eigenvectors of a real symmetric matrix A in packed storage