DPPTRS (3) Linux Manual Page

dpptrs.f –

Synopsis

Functions/Subroutines

subroutine dpptrs (UPLO, N, NRHS, AP, B, LDB, INFO)
DPPTRS

Function/Subroutine Documentation

subroutine dpptrs (characterUPLO, integerN, integerNRHS, double precision, dimension( * )AP, double precision, dimension( ldb, * )B, integerLDB, integerINFO)

DPPTRS

Purpose:

 DPPTRS solves a system of linear equations A*X = B with a symmetric

 positive definite matrix A in packed storage using the Cholesky

 factorization A = U**T*U or A = L*L**T computed by DPPTRF.

 

Parameters:

UPLO

 UPLO is CHARACTER*1

 = ‘U’: Upper triangle of A is stored;

 = ‘L’: Lower triangle of A is stored.

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 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

 B is DOUBLE PRECISION 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 109 of file dpptrs.f.

Author

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