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IRIX 6.2 Development Libraries
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SGI IRIX 6.2 Development Libraries.iso
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zpotri.z
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zpotri
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1996-03-14
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67 lines
ZZZZPPPPOOOOTTTTRRRRIIII((((3333FFFF)))) ZZZZPPPPOOOOTTTTRRRRIIII((((3333FFFF))))
NNNNAAAAMMMMEEEE
ZPOTRI - compute the inverse of a complex Hermitian positive definite
matrix A using the Cholesky factorization A = U**H*U or A = L*L**H
computed by ZPOTRF
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE ZPOTRI( UPLO, N, A, LDA, INFO )
CHARACTER UPLO
INTEGER INFO, LDA, N
COMPLEX*16 A( LDA, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
ZPOTRI computes the inverse of a complex Hermitian positive definite
matrix A using the Cholesky factorization A = U**H*U or A = L*L**H
computed by ZPOTRF.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
UPLO (input) CHARACTER*1
= 'U': Upper triangle of A is stored;
= 'L': Lower triangle of A is stored.
N (input) INTEGER
The order of the matrix A. N >= 0.
A (input/output) COMPLEX*16 array, dimension (LDA,N)
On entry, the triangular factor U or L from the Cholesky
factorization A = U**H*U or A = L*L**H, as computed by ZPOTRF.
On exit, the upper or lower triangle of the (Hermitian) inverse
of A, overwriting the input factor U or L.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
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