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- CSYTRI - compute the inverse of a complex symmetric indefinite matrix A
- using the factorization A = U*D*U**T or A = L*D*L**T computed by CSYTRF
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CSYTRI( UPLO, N, A, LDA, IPIV, WORK, INFO )
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- CHARACTER UPLO
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- INTEGER INFO, LDA, N
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- INTEGER IPIV( * )
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- COMPLEX A( LDA, * ), 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
- CSYTRI computes the inverse of a complex symmetric indefinite matrix A
- using the factorization A = U*D*U**T or A = L*D*L**T computed by CSYTRF.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- UPLO (input) CHARACTER*1
- Specifies whether the details of the factorization are stored as
- an upper or lower triangular matrix. = 'U': Upper triangular,
- form is A = U*D*U**T;
- = 'L': Lower triangular, form is A = L*D*L**T.
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- N (input) INTEGER
- The order of the matrix A. N >= 0.
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- A (input/output) COMPLEX array, dimension (LDA,N)
- On entry, the block diagonal matrix D and the multipliers used to
- obtain the factor U or L as computed by CSYTRF.
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- On exit, if INFO = 0, the (symmetric) inverse of the original
- matrix. If UPLO = 'U', the upper triangular part of the inverse
- is formed and the part of A below the diagonal is not referenced;
- if UPLO = 'L' the lower triangular part of the inverse is formed
- and the part of A above the diagonal is not referenced.
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(1,N).
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- IPIV (input) INTEGER array, dimension (N)
- Details of the interchanges and the block structure of D as
- determined by CSYTRF.
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- WORK (workspace) COMPLEX array, dimension (2*N)
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- INFO (output) INTEGER
- = 0: successful exit
- < 0: if INFO = -i, the i-th argument had an illegal value
- > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
- inverse could not be computed.
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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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