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dpptri.f(3)				      LAPACK				      dpptri.f(3)

       dpptri.f -

       subroutine dpptri (UPLO, N, AP, INFO)

Function/Subroutine Documentation
   subroutine dpptri (characterUPLO, integerN, double precision, dimension( * )AP, integerINFO)


	    DPPTRI 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 DPPTRF.


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


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


		     AP is DOUBLE PRECISION 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 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.

	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

	   November 2011

       Definition at line 94 of file dpptri.f.

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      dpptri.f(3)
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