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c Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
c Copyright (C) INRIA
c
c This file must be used under the terms of the CeCILL.
c This source file is licensed as described in the file COPYING, which
c you should have received as part of this distribution. The terms
c are also available at
c http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
subroutine front(nq,tq,nbout,w)
C!but
C cette routine calcule le nombre de racines du polynome q(z) qui
C sont situees a l'exterieur du cercle unite .
C!liste d'appel
C subroutine front(nq,tq,nbout,w)
C dimension tq(0:*),w(*)
C Entree :
C - nq . est le degre du polynome q(z)
C - tq . le tableau du polynome en question
C
C Sortie :
C -nbout . est le nombre de racine a l'exterieur du du cercle unite
C tableau de travail
C -w 3*nq+1
C!
implicit double precision (a-h,o-z)
dimension tq(nq+1), w(*)
C
integer fail
C
lpol = 1
lzr = lpol + nq + 1
lzi = lzr + nq
lzmod = lpol
lfree = lzi + nq
C
call dcopy(nq+1,tq,1,w(lpol),-1)
call rpoly(w(lpol),nq,w(lzr),w(lzi),fail)
call modul(nq,w(lzr),w(lzi),w(lzmod))
C
nbout = 0
nbon = 0
do 110 i = 1,nq
if (w(lzmod-1+i) .gt. 1.0d+0) then
nbout = nbout + 1
endif
if (w(lzmod-1+i) .eq. 1.0d+0) then
nbon = nbon + 1
endif
110 continue
C
return
end
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