+++ /dev/null
-c===========================================================================
-c
-c This file is part of TISEAN
-c
-c Copyright (c) 1998-2007 Rainer Hegger, Holger Kantz, Thomas Schreiber
-c
-c TISEAN is free software; you can redistribute it and/or modify
-c it under the terms of the GNU General Public License as published by
-c the Free Software Foundation; either version 2 of the License, or
-c (at your option) any later version.
-c
-c TISEAN is distributed in the hope that it will be useful,
-c but WITHOUT ANY WARRANTY; without even the implied warranty of
-c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-c GNU General Public License for more details.
-c
-c You should have received a copy of the GNU General Public License
-c along with TISEAN; if not, write to the Free Software
-c Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-c
-c===========================================================================
-c Wiener filter x according to spectrum a
-c (routine needed by surrogates.f)
-C author Thomas Schreiber (1998)
-c===========================================================================
- function tospec(nmax,a,x,ibin)
- parameter(nx=1000000)
- dimension x(nmax), a(nmax), w(nx), w1(nx), w2(nx), iw(15)
- save w2, iw
-
- if(nmax.gt.nx) stop "tospec: make nx larger."
- do 10 n=1,nmax
- 10 w(n)=x(n)
- call rffti1(nmax,w2,iw)
- call rfftf1(nmax,x,w1,w2,iw)
- do 20 n=1,nmax
- 20 x(n)=x(n)/real(nmax)
- x(1)=x(1)*(a(1)/x(1)**2)
- do 30 i=2+ibin,(nmax+1)/2-ibin,2*ibin+1
- p=0
- do 40 ib=i-ibin,i+ibin
- 40 p=p+x(2*ib-2)**2+x(2*ib-1)**2
- ab=a(2*i-2)/p
- do 30 ib=i-ibin,i+ibin
- x(2*ib-2)=x(2*ib-2)*ab
- 30 x(2*ib-1)=x(2*ib-1)*ab
- if(mod(nmax,2).eq.0) x(nmax)=x(nmax)*(a(nmax)/x(nmax)**2)
- call rfftb1(nmax,x,w1,w2,iw)
- tospec=0
- do 50 n=1,nmax
- 50 tospec=tospec+(x(n)-w(n))**2
- tospec=sqrt(tospec/nmax)
- end