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pwhg_bookhist-multi.f
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subroutine setupmulti(n)
implicit none
integer n
include 'pwhg_bookhist-multi.h'
real * 8 weirdnum
common/c_setupmulti/weirdnum
save /c_setupmulti/
c if this is set we are sure that setupmulti was called
weirdnum=317d0/12345d0
if(n.gt.maxmulti) then
write(*,*) ' ************** ERROR **************'
write(*,*) ' multi-weight histogramming requested with',n,
1 'weights > ',maxmulti
write(*,*) ' increase maxmulti in pwhg-bookhist-multi.h'
call pwhg_exit(-1)
endif
nmulti=n
end
subroutine bookupeqbins(string,binsize,xlow,xhigh)
implicit none
character *(*) string
real * 8 binsize,xlow,xhigh
include 'pwhg_bookhist-multi.h'
real * 8 xx(maxbins+1)
integer k
xx(1)=xlow
do k=2,maxbins+1
xx(k)=xx(k-1)+binsize
c avoid funny bin edges near zero ...
if(abs(xx(k)/binsize).lt.1d-6) xx(k) = 0
if(xx(k)-(xhigh-binsize/1e4).gt.0) goto 10
enddo
write(*,*) 'bookupeqbins: too many bins in hist ',string
call exit(-1)
10 continue
if((xx(k)-xhigh)/binsize.gt.1e-4) then
write(*,*) 'upper limit incompatible with bin size'
write(*,*) 'replacing ',xhigh,' with ',xx(k)
write(*,*) ' in histogram ',string
endif
call bookup(string,k-1,xx)
end
subroutine bookup(string,n,x)
c Books up a histogram characterized by the tag string <string>,
c with n bins. The array x(n+1) are the bins endpoints,
c x(i) is the low extreme of bin i.
implicit none
character *(*) string
integer n
real * 8 x(n+1)
include 'pwhg_bookhist-multi.h'
integer j,k
integer indexhist
real * 8 weirdnum
common/c_setupmulti/weirdnum
save /c_setupmulti/
logical ini
data ini/.true./
save ini
c We assume that this routine is always called first when the package is used
if(ini) then
if(.not.weirdnum.eq.317d0/12345d0) then
c setupmulti was not called! setup default value!
call setupmulti(1)
endif
ini=.false.
endif
if(n.gt.maxbins) then
write(*,*) ' maximum number of bins=',maxbins
write(*,*) ' asked for ',n
call exit(-1)
endif
c indexhist(string) returns the histogram index if a histogram
c with tag string was already booked, otherwise it books a new histogram,
c and returns minus the value of its index
j=-indexhist(string)
if(j.lt.0) then
write(*,*) 'Histogram ',string,' already booked'
call exit(-1)
endif
do k=1,n+1
xhistarr(k,j)=x(k)
enddo
c y and err values go from 0 to n+1, 0 being the underflow and n+1
c the overflow.
do k=0,n+1
yhistarr(:,k,j)=0
yhistarr1(:,k,j)=0
errhistarr1(:,k,j)=0
yhistarr2(:,k,j)=0
errhistarr2(:,k,j)=0
nhits(k,j)=0
enddo
nbins(j)=n
ient1(j)=0
end
function indexhist(string)
implicit none
character * (*) string
include 'pwhg_bookhist-multi.h'
integer indexhist
integer j,khist
if(string.eq.' ') then
write(*,*) ' indexhist: error, empty name'
call exit(-1)
endif
khist = -1
do j=1,jhist
if(stringhist(j).eq.' ') then
khist = j
endif
if(stringhist(j).eq.string) then
indexhist=j
return
endif
enddo
if(khist.gt.0) then
goto 999
endif
if(jhist.eq.nhist) then
write(*,*) ' no more rooms for histograms'
write(*,*) ' Histogram "',string,'" cannot be booked'
call exit(-1)
endif
jhist=jhist+1
khist = jhist
999 stringhist(khist)=trim(adjustl(string))
if(stringhist(khist).ne.trim(adjustl(string))) then
write(*,*) ' Histogram string "',string,'" too long'
call exit(-1)
endif
c the negative sign indicates a new histogram
indexhist=-khist
end
subroutine deletehist(string,iret)
implicit none
character * (*) string
integer iret
include 'pwhg_bookhist-multi.h'
integer j
if(string.eq.' ') then
write(*,*) ' deletehist: error, empty name'
call exit(-1)
endif
do j=1,jhist
if(stringhist(j).eq.string) then
stringhist(j)=' '
return
iret = 0
endif
enddo
write(*,*) ' deletehist: histogram '//string
1 //' not present'
iret = -1
end
subroutine filld(string,xval,weight)
implicit none
character *(*) string
include 'pwhg_bookhist-multi.h'
real * 8 xval,weight(1:nmulti)
integer j,k,indexhist
j=indexhist(string)
if(j.lt.0) then
write(*,*) ' histogram "',string,'" was not booked'
call exit(-1)
endif
c underflow
if(xval.lt.xhistarr(1,j)) then
yhistarr(1:nmulti,0,j)=yhistarr(1:nmulti,0,j)+weight
nhits(0,j)=nhits(0,j)+1
return
else
do k=1,nbins(j)
if(xval.lt.xhistarr(k+1,j)) then
yhistarr(1:nmulti,k,j)=yhistarr(1:nmulti,k,j)+weight/
1 (xhistarr(k+1,j)-xhistarr(k,j))
nhits(k,j)=nhits(k,j)+1
return
endif
enddo
endif
c overflow
yhistarr(1:nmulti,nbins(j)+1,j)=yhistarr(1:nmulti,nbins(j)+1,j)
1 +weight
end
subroutine inihists
implicit none
include 'pwhg_bookhist-multi.h'
jhist=0
end
subroutine pwhgtopout(filename)
implicit none
character * (*) filename
include 'pwhg_bookhist-multi.h'
integer k,j,iun,l
character * 3 cl
call newunit(iun)
do l=1,nmulti
if(nmulti.eq.1) then
open(unit=iun,file=trim(adjustl(filename))//'.top',
1 status='unknown')
else
write(cl,'(i3)') l
open(unit=iun,file=trim(adjustl(filename))//'-W'//
1 trim(adjustl(cl))//'.top',status='unknown')
endif
do j=1,jhist
write(iun,'(a,i3)')'# '//trim(adjustl(stringhist(j)))//
1 ' index ',j-1
do k=1,nbins(j)
write(iun,'(4(1x,e14.8))') xhistarr(k,j),
1 xhistarr(k+1,j),yhistarr2(l,k,j),errhistarr2(l,k,j)
enddo
write(iun,*)
write(iun,*)
enddo
close(iun)
enddo
end
subroutine pwhgaccumup
c values histogrammed so far are transferred to array yhistarr1,
c and the square of the values are transferred to array errhistarr1.
c yhistarr is zeroed. The index ient1 is increased by one unit.
implicit none
include 'pwhg_bookhist-multi.h'
integer j,k
do j=1,jhist
do k=0,nbins(j)+1
yhistarr1(1:nmulti,k,j)=yhistarr1(1:nmulti,k,j)
1 +yhistarr(1:nmulti,k,j)
errhistarr1(1:nmulti,k,j)=errhistarr1(1:nmulti,k,j)
1 +yhistarr(1:nmulti,k,j)**2
yhistarr(1:nmulti,k,j)=0
enddo
ient1(j)=ient1(j)+1
enddo
end
subroutine pwhgsetout
c provides a snapshot of the current result of the
c analysis, leaving the yhistarr1 and errhistarr1 unchanged.
implicit none
include 'pwhg_bookhist-multi.h'
integer j,k
real *8 xxx,sum(1:nmulti),sumsq(1:nmulti)
do j=1,jhist
xxx=1d0/ient1(j)
do k=0,nbins(j)+1
sum=yhistarr1(1:nmulti,k,j)
sumsq=errhistarr1(1:nmulti,k,j)
yhistarr2(1:nmulti,k,j)=xxx*sum
errhistarr2(1:nmulti,k,j)=sqrt(xxx**2*abs(sumsq-sum**2*xxx))
enddo
enddo
end
subroutine pwhgaddout
c accumulates the results obtained so far in yhistarr2 and errhistarr2.
c It zeroes yhistarr1 and errhistarr1. To be used if we compute
c a cross section with several contributions.
implicit none
include 'pwhg_bookhist-multi.h'
integer j,k
real *8 xxx,sum(1:nmulti),sumsq(1:nmulti)
do j=1,jhist
xxx=1d0/ient1(j)
do k=0,nbins(j)+1
sum=yhistarr1(1:nmulti,k,j)
sumsq=errhistarr1(1:nmulti,k,j)
yhistarr2(1:nmulti,k,j)=yhistarr2(1:nmulti,k,j)+xxx*sum
errhistarr2(1:nmulti,k,j)=sqrt(errhistarr2(1:nmulti,k,j)**2+
1 xxx**2*abs(sumsq-sum**2*xxx))
enddo
enddo
do j=1,jhist
do k=0,nbins(j)+1
yhistarr1(1:nmulti,k,j)=0
errhistarr1(1:nmulti,k,j)=0
enddo
ient1(j)=0
enddo
end