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- CLAUUM - compute the product U * U' or L' * L, where the triangular
- factor U or L is stored in the upper or lower triangular part of the
- array A
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- SUBROUTINE CLAUUM( UPLO, N, A, LDA, INFO )
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- CHARACTER 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
- CLAUUM computes the product U * U' or L' * L, where the triangular factor
- U or L is stored in the upper or lower triangular part of the array A. If
- UPLO = 'U' or 'u' then the upper triangle of the result is stored,
- overwriting the factor U in A.
- If UPLO = 'L' or 'l' then the lower triangle of the result is stored,
- overwriting the factor L in A.
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- This is the blocked form of the algorithm, calling Level 3 BLAS.
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- UPLO (input) CHARACTER*1
- Specifies whether the triangular factor stored in the array A is
- upper or lower triangular:
- = 'U': Upper triangular
- = 'L': Lower triangular
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- N (input) INTEGER
- The order of the triangular factor U or L. N >= 0.
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- A (input/output) COMPLEX array, dimension (LDA,N)
- On entry, the triangular factor U or L. On exit, if UPLO = 'U',
- the upper triangle of A is overwritten with the upper triangle of
- the product U * U'; if UPLO = 'L', the lower triangle of A is
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- PPPPaaaaggggeeee 1111
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- CCCCLLLLAAAAUUUUUUUUMMMM((((3333SSSS)))) CCCCLLLLAAAAUUUUUUUUMMMM((((3333SSSS))))
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- overwritten with the lower triangle of the product L' * L.
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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 = -k, the k-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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