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 Fourier power spectrum
23 c author T. Schreiber (1998) and earlier
24 c modified by H. Kantz 2007
25 c===========================================================================
28 character*72 file, fout
32 call whatido("Power spectrum by FFT",iverb)
38 isout=igetout(fout,iverb)
40 do 10 ifi=1,nstrings()
41 call nthstring(ifi,file)
43 call readfile(nmax,x,nexcl,jcol,file,iverb)
44 if(file.eq."-") file="stdin"
45 if(isout.eq.1) call addsuff(fout,file,"_sp")
48 . write(istderr(),*) "spectrum: using first ", nmaxp
49 if(dh.eq.0.) dh=h/nmaxp
51 if(ibin.gt.0) write(istderr(),*)
52 . "spectrum: binning", 2*ibin+1," frequencies"
53 call store_spec(nmaxp,x,0)
54 call outfile(fout,iunit,iverb)
55 write(iunit,*) 0., x(1)
56 do 20 i=2+ibin,nmaxp/2+1-ibin,2*ibin+1
58 do 30 ib=i-ibin,i+ibin
60 20 write(iunit,*) h*(i-1)/real(nmaxp), p
61 if(iunit.eq.istdout()) write(iunit,*)
62 if(iunit.eq.istdout()) write(iunit,*)
63 10 if(iunit.ne.istdout()) close(iunit)
70 . "[-f# -w# -o outfile -l# -x# -c# -V# -h] file(s)")
71 call popt("f","sampling rate, e.g. in Hz [default 1.]")
72 call popt("w","frequency resolution, e.g. in Hz, [default 1/N]")
73 call popt("l","number of values to be read [all]")
74 call popt("x","number of values to be skipped [0]")
75 call popt("c","column to be read, [1] or file,#")