Mac binaries

[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_f / store_spec.f

diff --git a/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_f/store_spec.f b/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_f/store_spec.f
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+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   store data periodogram of x 
+c   if iback.ne.0 transform back to get autocorrelation instead
+C   author Thomas Schreiber (1998)
+c===========================================================================
+      subroutine store_spec(nmax,x,iback)
+      parameter(nx=1000000)
+      dimension x(nmax), w1(nx), w2(nx), iw(15)
+      save w2, iw
+
+      if(nmax.gt.nx) stop "store_spec: make nx larger."
+      call rffti1(nmax,w2,iw)  
+      call rfftf1(nmax,x,w1,w2,iw)
+      do 10 n=1,nmax
+ 10      x(n)=x(n)/real(nmax)
+      x(1)=x(1)**2
+      do 20 n=2,(nmax+1)/2
+         amp=x(2*n-2)**2+x(2*n-1)**2
+         pha=atan2(x(2*n-1),x(2*n-2))
+         x(2*n-2)=amp
+ 20      x(2*n-1)=pha
+      if(mod(nmax,2).eq.0) x(nmax)=x(nmax)**2
+      if(iback.eq.0) return
+      do 30 n=1,nmax
+ 30      x(n)=x(n)*nmax
+      do 40 n=2,(nmax+1)/2
+ 40      x(2*n-1)=0
+      call rfftb1(nmax,x,w1,w2,iw)
+      end