SRC/spptri.f(3)            Library Functions Manual            SRC/spptri.f(3)

NAME
       SRC/spptri.f

SYNOPSIS
   Functions/Subroutines
       subroutine spptri (uplo, n, ap, info)
           SPPTRI

Function/Subroutine Documentation
   subroutine spptri (character uplo, integer n, real, dimension( * ) ap,
       integer info)
       SPPTRI

       Purpose:


           !>
           !> SPPTRI computes the inverse of a real symmetric positive definite
           !> matrix A using the Cholesky factorization A = U**T*U or A = L*L**T
           !> computed by SPPTRF.
           !>

       Parameters
           UPLO

           !>          UPLO is CHARACTER*1
           !>          = 'U':  Upper triangular factor is stored in AP;
           !>          = 'L':  Lower triangular factor is stored in AP.
           !>

           N

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

           AP

           !>          AP is REAL array, dimension (N*(N+1)/2)
           !>          On entry, the triangular factor U or L from the Cholesky
           !>          factorization A = U**T*U or A = L*L**T, packed columnwise as
           !>          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.
           !>
           !>          On exit, the upper or lower triangle of the (symmetric)
           !>          inverse of A, overwriting the input factor U or L.
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value
           !>          > 0:  if INFO = i, the (i,i) element of the factor U or L is
           !>                zero, and the inverse could not be computed.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 92 of file spptri.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/spptri.f(3)