1 c===========================================================================
3 c This file is part of TISEAN
5 c Copyright (c) 1998-2007 Rainer Hegger, Holger Kantz, Thomas Schreiber
7 c TISEAN is free software; you can redistribute it and/or modify
8 c it under the terms of the GNU General Public License as published by
9 c the Free Software Foundation; either version 2 of the License, or
10 c (at your option) any later version.
12 c TISEAN is distributed in the hope that it will be useful,
13 c but WITHOUT ANY WARRANTY; without even the implied warranty of
14 c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 c GNU General Public License for more details.
17 c You should have received a copy of the GNU General Public License
18 c along with TISEAN; if not, write to the Free Software
19 c Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 c===========================================================================
22 c store data periodogram of x
23 c if iback.ne.0 transform back to get autocorrelation instead
24 C author Thomas Schreiber (1998)
25 c===========================================================================
26 subroutine store_spec(nmax,x,iback)
28 dimension x(nmax), w1(nx), w2(nx), iw(15)
31 if(nmax.gt.nx) stop "store_spec: make nx larger."
32 call rffti1(nmax,w2,iw)
33 call rfftf1(nmax,x,w1,w2,iw)
35 10 x(n)=x(n)/real(nmax)
38 amp=x(2*n-2)**2+x(2*n-1)**2
39 pha=atan2(x(2*n-1),x(2*n-2))
42 if(mod(nmax,2).eq.0) x(nmax)=x(nmax)**2
48 call rfftb1(nmax,x,w1,w2,iw)