SSPTRS (3) - Linux Manuals

NAME

ssptrs.f -

SYNOPSIS

Functions/Subroutines

subroutine ssptrs (UPLO, N, NRHS, AP, IPIV, B, LDB, INFO)
SSPTRS

Function/Subroutine Documentation

subroutine ssptrs (characterUPLO, integerN, integerNRHS, real, dimension( * )AP, integer, dimension( * )IPIV, real, dimension( ldb, * )B, integerLDB, integerINFO)

SSPTRS

Purpose:

 SSPTRS 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 SSPTRF.

 

Parameters:

UPLO

          UPLO is CHARACTER*1
          Specifies whether the details of the factorization are stored
          as an upper or lower triangular matrix.
          = 'U':  Upper triangular, form is A = U*D*U**T;
          = 'L':  Lower triangular, form is A = L*D*L**T.

N

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

NRHS

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

AP

          AP is REAL 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 SSPTRF, stored as a
          packed triangular matrix.

IPIV

          IPIV is INTEGER array, dimension (N)
          Details of the interchanges and the block structure of D
          as determined by SSPTRF.

B

          B is REAL array, dimension (LDB,NRHS)
          On entry, the right hand side matrix B.
          On exit, the solution matrix X.

LDB

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

INFO

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

 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 116 of file ssptrs.f.

Author

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