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ctrexc (3)
  • >> ctrexc (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         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
    
    SYNOPSIS
         SUBROUTINE CTREXC( COMPQ, N, T, LDT,  Q,  LDQ,  IFST,  ILST,
                   INFO )
    
         CHARACTER COMPQ
    
         INTEGER IFST, ILST, INFO, LDQ, LDT, N
    
         COMPLEX Q( LDQ, * ), T( LDT, * )
    
    
    
         #include <sunperf.h>
    
         void ctrexc(char compq, int n, complex *t, int ldt,  complex
                   *q, int ldq, int ifst, int ilst, int * info) ;
    
    PURPOSE
         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.
    
    
    ARGUMENTS
         COMPQ     (input) CHARACTER*1
                   = 'V':  update the matrix Q of Schur vectors;
                   = 'N':  do not update Q.
    
         N         (input) INTEGER
                   The order of the matrix T. N >= 0.
    
         T         (input/output) COMPLEX array, dimension (LDT,N)
                   On entry, the upper triangular matrix T.  On exit,
                   the reordered upper triangular matrix.
    
         LDT       (input) INTEGER
                   The leading dimension  of  the  array  T.  LDT  >=
                   max(1,N).
    
         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.
    
         LDQ       (input) INTEGER
                   The leading dimension of  the  array  Q.   LDQ  >=
                   max(1,N).
    
         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.
    
         INFO      (output) INTEGER
                   = 0:  successful exit
                   < 0:  if INFO = -i, the i-th argument had an ille-
                   gal value
    
    
    
    


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