CINVIT man page on IRIX

Man page or keyword search:  
man Server   31559 pages
apropos Keyword Search (all sections)
Output format
IRIX logo
[printable version]



_CINVIT(3F)							   _CINVIT(3F)

NAME
     CINVIT, SCINVIT  -	 EISPACK routine.  This subroutine finds those
     eigenvectors of A COMPLEX UPPER Hessenberg matrix corresponding to
     specified eigenvalues, using inverse iteration.

SYNOPSYS
	  subroutine  cinvit(nm, n, ar, ai, wr, wi, select, mm, m, zr, zi,
	  1	       ierr, rm1, rm2, rv1, rv2)
	  integer	   nm, n, mm, m, ierr
	  double precision ar(nm,n),  ai(nm,n), wr(n), wi(n)
	  double precision zr(nm,mm), zi(nm,mm)
	  double precision rm1(n,n),  rm2(n,n), rv1(n), rv2(n)
	  logical	   select(n)

	  subroutine scinvit(nm, n, ar, ai, wr, wi, select, mm, m, zr, zi,
	  1	       ierr, rm1, rm2, rv1, rv2)
	  integer	   nm, n, mm, m, ierr
	  real		   ar(nm,n),  ai(nm,n), wr(n), wi(n)
	  real		   zr(nm,mm), zi(nm,mm)
	  real		   rm1(n,n),  rm2(n,n), rv1(n), rv2(n)
	  logical	   select(n)

DESCRIPTION
     On INPUT

     NM must be set to the row dimension of two-dimensional array parameters
     as declared in the calling program dimension statement.

     N is the order of the matrix.

     AR and AI contain the real and imaginary parts, respectively, of the
     Hessenberg matrix.

     WR and WI contain the real and imaginary parts, respectively, of the
     eigenvalues of the matrix.	 The eigenvalues must be stored in a manner
     identical to that of subroutine  COMLR, which recognizes possible
     splitting of the matrix.

     SELECT specifies the eigenvectors to be found.  The eigenvector
     corresponding to the J-th eigenvalue is specified by setting SELECT(J) to
     .TRUE.

     MM should be set to an upper bound for the number of eigenvectors to be
     found.  On OUTPUT

     AR , AI, WI, and SELECT are unaltered.

     WR may have been altered since close eigenvalues are perturbed slightly
     in searching for independent eigenvectors.

									Page 1

_CINVIT(3F)							   _CINVIT(3F)

     M is the number of eigenvectors actually found.

     ZR and ZI contain the real and imaginary parts, respectively, of the
     eigenvectors.  The eigenvectors are normalized so that the component of
     largest magnitude is 1.  Any vector which fails the acceptance test is
     set to zero.

     IERR is set to Zero       for normal return, -(2*N+1)   if more than MM
     eigenvectors have been specified, -K	  if the iteration
     corresponding to the K-th
	value fails, -(N+K)	if both error situations occur.

     RM1 , RM2, RV1, and RV2 are temporary storage arrays. The ALGOL procedure
     GUESSVEC appears in CINVIT in line.  Calls PYTHAG(A,B) for sqrt(A**2 +
     B**2).  Calls CDIV for complex division.  Questions and comments should
     be directed to B. S. Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE
     NATIONAL LABORATORY

									Page 2

[top]

List of man pages available for IRIX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net