ztrexc.f - Online Linux Manual Page

Section : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK
NAMEztrexc.f
SYNOPSIS
Functions/Subroutinessubroutine ztrexc (COMPQ, N, T, LDT, Q, LDQ, IFST, ILST, INFO)
ZTREXC
Function/Subroutine Documentation
subroutine ztrexc (character COMPQ, integer N, complex*16, dimension( ldt, * ) T, integer LDT, complex*16, dimension( ldq, * ) Q, integer LDQ, integer IFST, integer ILST, integer INFO)ZTREXC Purpose: ZTREXC 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.Parameters: COMPQ COMPQ is CHARACTER*1 = 'V': update the matrix Q of Schur vectors; = 'N': do not update Q.
N N is INTEGER The order of the matrix T. N >= 0. If N == 0 arguments ILST and IFST may be any value.
T T is COMPLEX*16 array, dimension (LDT,N) On entry, the upper triangular matrix T. On exit, the reordered upper triangular matrix.
LDT LDT is INTEGER The leading dimension of the array T. LDT >= max(1,N).
Q Q is COMPLEX*16 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 LDQ is INTEGER The leading dimension of the array Q. LDQ >= 1, and if COMPQ = 'V', LDQ >= max(1,N).
IFST IFST is INTEGER
ILST ILST is 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 INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal valueAuthor: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: December 2016 Definition at line 128 of file ztrexc​.f​.
AuthorGenerated automatically by Doxygen for LAPACK from the source code​. 0
Johanes Gumabo
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