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- NNNNAAAAMMMMEEEE
- ZPPCON - estimate the reciprocal of the condition number (in the 1-norm)
- of a complex Hermitian positive definite packed matrix using the Cholesky
- factorization A = U**H*U or A = L*L**H computed by ZPPTRF
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE ZPPCON( UPLO, N, AP, ANORM, RCOND, WORK, RWORK, INFO )
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- CHARACTER UPLO
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- INTEGER INFO, N
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- DOUBLE PRECISION ANORM, RCOND
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- DOUBLE PRECISION RWORK( * )
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- COMPLEX*16 AP( * ), WORK( * )
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- IIIIMMMMPPPPLLLLEEEEMMMMEEEENNNNTTTTAAAATTTTIIIIOOOONNNN
- These routines are part of the SCSL Scientific Library and can be loaded
- using either the -lscs or the -lscs_mp option. The -lscs_mp option
- directs the linker to use the multi-processor version of the library.
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- When linking to SCSL with -lscs or -lscs_mp, the default integer size is
- 4 bytes (32 bits). Another version of SCSL is available in which integers
- are 8 bytes (64 bits). This version allows the user access to larger
- memory sizes and helps when porting legacy Cray codes. It can be loaded
- by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
- only one of the two versions; 4-byte integer and 8-byte integer library
- calls cannot be mixed.
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- ZPPCON estimates the reciprocal of the condition number (in the 1-norm)
- of a complex Hermitian positive definite packed matrix using the Cholesky
- factorization A = U**H*U or A = L*L**H computed by ZPPTRF. An estimate is
- obtained for norm(inv(A)), and the reciprocal of the condition number is
- computed as RCOND = 1 / (ANORM * norm(inv(A))).
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- UPLO (input) CHARACTER*1
- = 'U': Upper triangle of A is stored;
- = 'L': Lower triangle of A is stored.
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- N (input) INTEGER
- The order of the matrix A. N >= 0.
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- AP (input) COMPLEX*16 array, dimension (N*(N+1)/2)
- The triangular factor U or L from the Cholesky factorization A =
- U**H*U or A = L*L**H, 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 =
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- PPPPaaaaggggeeee 1111
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- 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.
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- ANORM (input) DOUBLE PRECISION
- The 1-norm (or infinity-norm) of the Hermitian matrix A.
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- RCOND (output) DOUBLE PRECISION
- The reciprocal of the condition number of the matrix A, computed
- as RCOND = 1/(ANORM * AINVNM), where AINVNM is an estimate of the
- 1-norm of inv(A) computed in this routine.
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- WORK (workspace) COMPLEX*16 array, dimension (2*N)
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- RWORK (workspace) DOUBLE PRECISION array, dimension (N)
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- INFO (output) INTEGER
- = 0: successful exit
- < 0: if INFO = -i, the i-th argument had an illegal value
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- INTRO_LAPACK(3S), INTRO_SCSL(3S)
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- This man page is available only online.
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- PPPPaaaaggggeeee 2222
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