SEARCH NEW RPMS DIRECTORIES ABOUT FAQ VARIOUS BLOG DONATE YUM REPOSITORY

MAN page from OpenSuSE 12.X lapack-man-3.3.1-15.1.noarch.rpm

# CGEBAK

Section: LAPACK routine (version 3.2) (1)
Updated: April 2011
Index

## NAME

LAPACK-3 - forms the right or left eigenvectors of a complex general matrix by backward transformation on the computed eigenvectors of the balanced matrix output by CGEBAL

## SYNOPSIS

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

CHARACTERJOB, SIDE

INTEGERIHI, ILO, INFO, LDV, M, N

REALSCALE( * )

COMPLEXV( LDV, * )

## PURPOSE

CGEBAK forms the right or left eigenvectors of a complex generalmatrix by backward transformation on the computed eigenvectors of thebalanced matrix output by CGEBAL.

## ARGUMENTS

JOB     (input) CHARACTER*1

Specifies the type of backward transformation required:
= aqNaq, do nothing, return immediately;
= aqPaq, do backward transformation for permutation only;
= aqSaq, do backward transformation for scaling only;
= aqBaq, do backward transformations for both permutation and
scaling.
JOB must be the same as the argument JOB supplied to CGEBAL.

SIDE    (input) CHARACTER*1

= aqRaq:  V contains right eigenvectors;

= aqLaq:  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 CGEBAL.
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 CGEBAL.

M       (input) INTEGER

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

V       (input/output) COMPLEX array, dimension (LDV,M)

On entry, the matrix of right or left eigenvectors to be
transformed, as returned by CHSEIN or CTREVC.
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.

## Index

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

This document was created byman2html,using the manual pages.