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- CCCCUUUUNNNNGGGG2222LLLL((((3333SSSS)))) CCCCUUUUNNNNGGGG2222LLLL((((3333SSSS))))
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- NNNNAAAAMMMMEEEE
- CUNG2L - generate an m by n complex matrix Q with orthonormal columns,
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- SUBROUTINE CUNG2L( M, N, K, A, LDA, TAU, WORK, INFO )
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- INTEGER INFO, K, LDA, M, N
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- COMPLEX A( LDA, * ), TAU( * ), 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
- CUNG2L generates an m by n complex matrix Q with orthonormal columns,
- which is defined as the last n columns of a product of k elementary
- reflectors of order m
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- Q = H(k) . . . H(2) H(1)
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- as returned by CGEQLF.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- M (input) INTEGER
- The number of rows of the matrix Q. M >= 0.
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- N (input) INTEGER
- The number of columns of the matrix Q. M >= N >= 0.
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- K (input) INTEGER
- The number of elementary reflectors whose product defines the
- matrix Q. N >= K >= 0.
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- A (input/output) COMPLEX array, dimension (LDA,N)
- On entry, the (n-k+i)-th column must contain the vector which
- defines the elementary reflector H(i), for i = 1,2,...,k, as
- returned by CGEQLF in the last k columns of its array argument A.
- On exit, the m-by-n matrix Q.
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- PPPPaaaaggggeeee 1111
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- CCCCUUUUNNNNGGGG2222LLLL((((3333SSSS)))) CCCCUUUUNNNNGGGG2222LLLL((((3333SSSS))))
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- LDA (input) INTEGER
- The first dimension of the array A. LDA >= max(1,M).
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- TAU (input) COMPLEX array, dimension (K)
- TAU(i) must contain the scalar factor of the elementary reflector
- H(i), as returned by CGEQLF.
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- WORK (workspace) COMPLEX array, dimension (N)
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- INFO (output) INTEGER
- = 0: successful exit
- < 0: if INFO = -i, the i-th argument has 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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