sgebak.f(3) [centos man page]

sgebak.f(3)							      LAPACK							       sgebak.f(3)

NAME

       sgebak.f -

SYNOPSIS

   Functions/Subroutines
       subroutine sgebak (JOB, SIDE, N, ILO, IHI, SCALE, M, V, LDV, INFO)
	   SGEBAK

Function/Subroutine Documentation
   subroutine sgebak (characterJOB, characterSIDE, integerN, integerILO, integerIHI, real, dimension( * )SCALE, integerM, real, dimension( ldv, *
       )V, integerLDV, integerINFO)
       SGEBAK

       Purpose:

	    SGEBAK forms the right or left eigenvectors of a real general matrix
	    by backward transformation on the computed eigenvectors of the
	    balanced matrix output by SGEBAL.

       Parameters:
	   JOB

		     JOB is CHARACTER*1
		     Specifies the type of backward transformation required:
		     = 'N', do nothing, return immediately;
		     = 'P', do backward transformation for permutation only;
		     = 'S', do backward transformation for scaling only;
		     = 'B', do backward transformations for both permutation and
			    scaling.
		     JOB must be the same as the argument JOB supplied to SGEBAL.

	   SIDE

		     SIDE is CHARACTER*1
		     = 'R':  V contains right eigenvectors;
		     = 'L':  V contains left eigenvectors.

	   N

		     N is INTEGER
		     The number of rows of the matrix V.  N >= 0.

	   ILO

		     ILO is INTEGER

	   IHI

		     IHI is INTEGER
		     The integers ILO and IHI determined by SGEBAL.
		     1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.

	   SCALE

		     SCALE is REAL array, dimension (N)
		     Details of the permutation and scaling factors, as returned
		     by SGEBAL.

	   M

		     M is INTEGER
		     The number of columns of the matrix V.  M >= 0.

	   V

		     V is REAL array, dimension (LDV,M)
		     On entry, the matrix of right or left eigenvectors to be
		     transformed, as returned by SHSEIN or STREVC.
		     On exit, V is overwritten by the transformed eigenvectors.

	   LDV

		     LDV is INTEGER
		     The leading dimension of the array V. LDV >= max(1,N).

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th argument had an illegal value.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 130 of file sgebak.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       sgebak.f(3)

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SGEBAK(l)								 )								 SGEBAK(l)

NAME

       SGEBAK  -  form the right or left eigenvectors of a real general matrix by backward transformation on the computed eigenvectors of the bal-
       anced matrix output by SGEBAL

SYNOPSIS

       SUBROUTINE SGEBAK( JOB, SIDE, N, ILO, IHI, SCALE, M, V, LDV, INFO )

	   CHARACTER	  JOB, SIDE

	   INTEGER	  IHI, ILO, INFO, LDV, M, N

	   REAL 	  V( LDV, * ), SCALE( * )

PURPOSE

       SGEBAK forms the right or left eigenvectors of a real general matrix by backward transformation on the computed eigenvectors  of  the  bal-
       anced matrix output by SGEBAL.

ARGUMENTS

       JOB     (input) CHARACTER*1
	       Specifies  the  type  of backward transformation required: = 'N', do nothing, return immediately; = 'P', do backward transformation
	       for permutation only; = 'S', do backward transformation for scaling only; = 'B', do backward transformations for  both  permutation
	       and scaling.  JOB must be the same as the argument JOB supplied to SGEBAL.

       SIDE    (input) CHARACTER*1
	       = 'R':  V contains right eigenvectors;
	       = 'L':  V contains left eigenvectors.

       N       (input) INTEGER
	       The number of rows of the matrix V.  N >= 0.

       ILO     (input) INTEGER
	       IHI     (input) INTEGER The integers ILO and IHI determined by SGEBAL.  1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.

       SCALE   (input) REAL array, dimension (N)
	       Details of the permutation and scaling factors, as returned by SGEBAL.

       M       (input) INTEGER
	       The number of columns of the matrix V.  M >= 0.

       V       (input/output) REAL array, dimension (LDV,M)
	       On  entry,  the matrix of right or left eigenvectors to be transformed, as returned by SHSEIN or STREVC.  On exit, V is overwritten
	       by the transformed eigenvectors.

       LDV     (input) INTEGER
	       The leading dimension of the array V. LDV >= max(1,N).

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value.

LAPACK version 3.0						   15 June 2000 							 SGEBAK(l)

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sgebak.f(3) [centos man page]

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