+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 c2g.f
+c Gaussian kernel correlation integral from c2
+c author T. Schreiber (1998)
+c===========================================================================
+ parameter(meps=1000)
+ dimension e(meps), c(meps), lw(meps)
+ character*72 file, fout, aline
+ double precision g,gd,h,d,f,func,gg,ggd,err,dum1,dum2,a,b,dc,de
+ external func, funcd
+ common h,d,f
+ data iverb/1/
+
+ call whatido("Gaussian kernel correlation sum from c2",iverb)
+ isout=igetout(fout,iverb)
+ if(nstrings().eq.0) call usage()
+ call nthstring(1,file)
+ call infile(file,iunit,iverb)
+ if(isout.eq.1) call addsuff(fout,file,"_g")
+ call outfile(fout,iunit2,iverb)
+ 1 read(iunit,'(a)',end=999) aline
+ 4 if(aline(1:1).ne."#") goto 1
+ if(aline(1:1).eq."#")
+ . read(aline(index(aline,"m=")+2:72),'(i20)',err=1) m
+ me=0
+ 2 read(iunit,'(a)') aline
+ if(aline(1:72).eq." ") goto 3
+ me=me+1
+ read(aline,*,err=999,end=999) ee, cc
+ if(cc.le.0.) goto 3
+ e(me)=log(ee)
+ c(me)=log(cc)
+ goto 2
+ 3 write(iunit2,'(4h#m= ,i5)') m
+ call indexx(me,e,lw)
+ call index2sort(me,e,lw)
+ call index2sort(me,c,lw)
+ do 10 j=1,me
+ h=exp(e(j))
+ g=0
+ gd=0
+ do 20 k=1,me-1
+ f=exp((e(k+1)*c(k)-e(k)*c(k+1))/(e(k+1)-e(k)))
+ d=(c(k+1)-c(k))/(e(k+1)-e(k))
+ a=e(k)
+ b=e(k+1)
+ gg=0.
+ ggd=0.
+ if(b.ne.a) call dqk15(func,a,b,gg,err,dum1,dum2)
+ if(b.ne.a) call dqk15(funcd,a,b,ggd,err,dum1,dum2)
+ g=g+gg
+ 20 gd=gd+ggd
+ dc=c(me)
+ de=e(me)
+ cgauss=g/(h**2)+exp(-exp(2*de)/(2*h**2))
+ cgd=gd/(h**4)+(2+exp(2*de)/h**2)*exp(-exp(2*de)/(2*h**2))
+ 10 write(iunit2,*) h, cgauss, -2+cgd/cgauss
+ write(iunit2,'()')
+ write(iunit2,'()')
+ goto 4
+ 999 stop
+ end
+
+ double precision function func(u)
+ double precision h,d,f,u
+ common h,d,f
+
+ func=f*exp((2+d)*u-exp(2*u)/(2*h**2))
+ end
+
+ double precision function funcd(u)
+ double precision h,d,f,u
+ common h,d,f
+
+ funcd=f*exp((4+d)*u-exp(2*u)/(2*h**2))
+ end
+
+ subroutine usage()
+c usage message
+
+ call whatineed(
+ . "[-o outfile -V# -h] file")
+ call pout("file_g")
+ call pall()
+ stop
+ end
+
+
+