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- CCCCTTTTRRRRTTTTRRRRIIII((((3333SSSS)))) CCCCTTTTRRRRTTTTRRRRIIII((((3333SSSS))))
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- NNNNAAAAMMMMEEEE
- CTRTRI - compute the inverse of a complex upper or lower triangular
- matrix A
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CTRTRI( UPLO, DIAG, N, A, LDA, INFO )
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- CHARACTER DIAG, UPLO
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- INTEGER INFO, LDA, N
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- COMPLEX A( LDA, * )
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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
- CTRTRI computes the inverse of a complex upper or lower triangular matrix
- A. This is the Level 3 BLAS version of the algorithm.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- UPLO (input) CHARACTER*1
- = 'U': A is upper triangular;
- = 'L': A is lower triangular.
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- DIAG (input) CHARACTER*1
- = 'N': A is non-unit triangular;
- = 'U': A is unit triangular.
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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 triangular matrix A. If UPLO = 'U', the leading
- N-by-N upper triangular part of the array A contains the upper
- triangular matrix, and the strictly lower triangular part of A is
- not referenced. If UPLO = 'L', the leading N-by-N lower
- triangular part of the array A contains the lower triangular
- matrix, and the strictly upper triangular part of A is not
- referenced. If DIAG = 'U', the diagonal elements of A are also
- not referenced and are assumed to be 1. On exit, the
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- PPPPaaaaggggeeee 1111
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- CCCCTTTTRRRRTTTTRRRRIIII((((3333SSSS)))) CCCCTTTTRRRRTTTTRRRRIIII((((3333SSSS))))
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- (triangular) inverse of the original matrix, in the same storage
- format.
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(1,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, A(i,i) is exactly zero. The triangular matrix
- is singular and its inverse can 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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- PPPPaaaaggggeeee 2222
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