LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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dpptrs.f File Reference

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

Function/Subroutine Documentation

subroutine dpptrs ( character  UPLO,
integer  N,
integer  NRHS,
double precision, dimension( * )  AP,
double precision, dimension( ldb, * )  B,
integer  LDB,
integer  INFO 


Download DPPTRS + dependencies [TGZ] [ZIP] [TXT]
 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.
          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.
          N is INTEGER
          The order of the matrix A.  N >= 0.
          NRHS is INTEGER
          The number of right hand sides, i.e., the number of columns
          of the matrix B.  NRHS >= 0.
          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 is DOUBLE PRECISION array, dimension (LDB,NRHS)
          On entry, the right hand side matrix B.
          On exit, the solution matrix X.
          LDB is INTEGER
          The leading dimension of the array B.  LDB >= max(1,N).
          INFO is INTEGER
          = 0:  successful exit
          < 0:  if INFO = -i, the i-th argument had an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
November 2011

Definition at line 109 of file dpptrs.f.

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