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- DDDDOOOOPPPPGGGGTTTTRRRR((((3333SSSS)))) DDDDOOOOPPPPGGGGTTTTRRRR((((3333SSSS))))
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- NNNNAAAAMMMMEEEE
- DOPGTR - generate a real orthogonal matrix Q which is defined as the
- product of n-1 elementary reflectors H(i) of order n, as returned by
- DSPTRD using packed storage
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE DOPGTR( UPLO, N, AP, TAU, Q, LDQ, WORK, INFO )
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- CHARACTER UPLO
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- INTEGER INFO, LDQ, N
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- DOUBLE PRECISION AP( * ), Q( LDQ, * ), 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
- DOPGTR generates a real orthogonal matrix Q which is defined as the
- product of n-1 elementary reflectors H(i) of order n, as returned by
- DSPTRD using packed storage: if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),
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- if UPLO = 'L', Q = H(1) H(2) . . . H(n-1).
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- UPLO (input) CHARACTER*1
- = 'U': Upper triangular packed storage used in previous call to
- DSPTRD; = 'L': Lower triangular packed storage used in previous
- call to DSPTRD.
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- N (input) INTEGER
- The order of the matrix Q. N >= 0.
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- AP (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
- The vectors which define the elementary reflectors, as returned
- by DSPTRD.
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- TAU (input) DOUBLE PRECISION array, dimension (N-1)
- TAU(i) must contain the scalar factor of the elementary reflector
- H(i), as returned by DSPTRD.
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- PPPPaaaaggggeeee 1111
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- DDDDOOOOPPPPGGGGTTTTRRRR((((3333SSSS)))) DDDDOOOOPPPPGGGGTTTTRRRR((((3333SSSS))))
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- Q (output) DOUBLE PRECISION array, dimension (LDQ,N)
- The N-by-N orthogonal matrix Q.
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- LDQ (input) INTEGER
- The leading dimension of the array Q. LDQ >= max(1,N).
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- WORK (workspace) DOUBLE PRECISION array, dimension (N-1)
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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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