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Man Pages


Manual Reference Pages  -  DLASORTE (l)

NAME

DLASORTE - sort eigenpairs so that real eigenpairs are together and complex are together

CONTENTS

Synopsis
Purpose
Arguments

SYNOPSIS

SUBROUTINE DLASORTE( S, LDS, J, OUT, INFO )
    INTEGER INFO, J, LDS
    DOUBLE PRECISION OUT( J, * ), S( LDS, * )

PURPOSE

DLASORTE sorts eigenpairs so that real eigenpairs are together and complex are together. This way one can employ 2x2 shifts easily since every 2nd subdiagonal is guaranteed to be zero.
This routine does no parallel work.

ARGUMENTS

S (local input/output) DOUBLE PRECISION array, dimension LDS
  On entry, a matrix already in Schur form. On exit, the diagonal blocks of S have been rewritten to pair the eigenvalues. The resulting matrix is no longer similar to the input.
LDS (local input) INTEGER
  On entry, the leading dimension of the local array S. Unchanged on exit.
J (local input) INTEGER
  On entry, the order of the matrix S. Unchanged on exit.
OUT (local input/output) DOUBLE PRECISION array, dimension Jx2
  This is the work buffer required by this routine.
INFO (local input) INTEGER
  This is set if the input matrix had an odd number of real eigenvalues and things couldn’t be paired or if the input matrix S was not originally in Schur form. 0 indicates successful completion.

Implemented by: G. Henry, November 17, 1996

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ScaLAPACK version 1.7 DLASORTE (l) 13 August 2001

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