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- CTREXC - reorder the Schur factorization of a complex matrix A =
- Q*T*Q**H, so that the diagonal element of T with row index IFST is moved
- to row ILST
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CTREXC( COMPQ, N, T, LDT, Q, LDQ, IFST, ILST, INFO )
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- CHARACTER COMPQ
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- INTEGER IFST, ILST, INFO, LDQ, LDT, N
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- COMPLEX Q( LDQ, * ), T( LDT, * )
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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
- CTREXC reorders the Schur factorization of a complex matrix A = Q*T*Q**H,
- so that the diagonal element of T with row index IFST is moved to row
- ILST. The Schur form T is reordered by a unitary similarity
- transformation Z**H*T*Z, and optionally the matrix Q of Schur vectors is
- updated by postmultplying it with Z.
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- COMPQ (input) CHARACTER*1
- = 'V': update the matrix Q of Schur vectors;
- = 'N': do not update Q.
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- N (input) INTEGER
- The order of the matrix T. N >= 0.
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- T (input/output) COMPLEX array, dimension (LDT,N)
- On entry, the upper triangular matrix T. On exit, the reordered
- upper triangular matrix.
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- LDT (input) INTEGER
- The leading dimension of the array T. LDT >= max(1,N).
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- CCCCTTTTRRRREEEEXXXXCCCC((((3333SSSS)))) CCCCTTTTRRRREEEEXXXXCCCC((((3333SSSS))))
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- Q (input/output) COMPLEX array, dimension (LDQ,N)
- On entry, if COMPQ = 'V', the matrix Q of Schur vectors. On
- exit, if COMPQ = 'V', Q has been postmultiplied by the unitary
- transformation matrix Z which reorders T. If COMPQ = 'N', Q is
- not referenced.
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- LDQ (input) INTEGER
- The leading dimension of the array Q. LDQ >= max(1,N).
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- IFST (input) INTEGER
- ILST (input) INTEGER Specify the reordering of the diagonal
- elements of T: The element with row index IFST is moved to row
- ILST by a sequence of transpositions between adjacent elements.
- 1 <= IFST <= N; 1 <= ILST <= N.
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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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