+++ /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 autocor.f
-c autocorrelation function through FFT
-c author T. Schreiber (1998), H. Kantz (2007)
-c===========================================================================
-
- parameter(nx=1000000)
- dimension x(2*nx)
- character*72 file, fout
- data iverb/1/
-
- call whatido("autocorrelation function estimated by FFT",iverb)
- ivar=lopt('v',1)
- iper=lopt('p',1)
- iexact=lopt('P',1)
- if(iexact.ne.0) iper=1
- nmaxx=ican("l",nx)
- nexcl=ican("x",0)
- jcol=ican("c",0)
- isout=igetout(fout,iverb)
-
- do 10 ifi=1,nstrings()
- call nthstring(ifi,file)
- nmax=nmaxx
- call readfile(nmax,x,nexcl,jcol,file,iverb)
- if(file.eq."-") file="stdin"
- if(ivar.eq.0) call normal(nmax,x,sc,sd)
- if(iper.eq.0) then
- nmaxp=nmore(2*nmax)
- do 20 n=nmax+1,nmaxp
- 20 x(n)=0.
- call store_spec(nmaxp,x,1)
- do 30 n=1,nmax
- 30 x(n)=x(n)/real(nmax-n+1)
- else
- nmaxp=nmax
- if(iexact.eq.0) then
- nmaxp=nless(nmax)
- if(nmaxp.ne.nmax.and.iv_io(iverb).eq.1)
- . write(istderr(),*) "autocor: using", nmaxp
- endif
- call store_spec(nmaxp,x,1)
- do 50 n=1,nmaxp
- 50 x(n)=x(n)/real(nmaxp)
- endif
- if(isout.eq.1) call addsuff(fout,file,"_co")
- call outfile(fout,iunit,iverb)
- if(ivar.eq.0) then
- if(sd.eq.0) stop "autocor: cannot normalise - zero variance"
- fsc=1./x(1)
- else
- fsc=1.
- endif
- do 60 n=1,min(nmax,nmaxp)
- 60 write(iunit,*) n-1, fsc*x(n)
- 10 if(iunit.ne.istdout()) close(iunit)
- end
-
- subroutine usage()
-c usage message
-
- call whatineed(
- . "[-v -p -P -o outfile -l# -x# -c# -V# -h] file(s)")
- call popt("v","give unnormalised autocovariance")
- call popt("p","assume periodic continuation")
- call popt("P","assume periodic continuation exactly")
- call popt("l","number of values to be read [all]")
- call popt("x","number of values to be skipped [0]")
- call popt("c","column to be read [1 or file,#]")
- call pout("file_co")
- call pall()
- stop
- end
-
-
-