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  man pages->IRIX man pages -> complib/spptri (3)              
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SPPTRI(3F)							    SPPTRI(3F)


NAME    [Toc]    [Back]

     SPPTRI - compute 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

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	SPPTRI(	UPLO, N, AP, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, N

	 REAL		AP( * )

PURPOSE    [Toc]    [Back]

     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.

ARGUMENTS    [Toc]    [Back]

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

     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     AP	     (input/output) 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    (output) 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.
SPPTRI(3F)							    SPPTRI(3F)


NAME    [Toc]    [Back]

     SPPTRI - compute 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

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	SPPTRI(	UPLO, N, AP, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, N

	 REAL		AP( * )

PURPOSE    [Toc]    [Back]

     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.

ARGUMENTS    [Toc]    [Back]

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

     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     AP	     (input/output) 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    (output) 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.


									PPPPaaaaggggeeee 1111
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