1 subroutine MRST98evolve(x,Q,pdf)
2 implicit real*8(a-h,o-z)
3 include 'parmsetup.inc'
4 character*16 name(nmxset)
5 integer nmem(nmxset),ndef(nmxset),mmem
7 common/NAME/name,nmem,ndef,mmem
8 parameter(nx=49,nq=37,ntenth=23,np=8,members=5)
10 real*8 f(0:members,np,nx,nq+1)
11 real*8 qq(nq),xx(nx),xxin(nx),g(np),n0(np)
12 data xxin/1d-5,2d-5,4d-5,6d-5,8d-5,
13 . 1d-4,2d-4,4d-4,6d-4,8d-4,
14 . 1d-3,2d-3,4d-3,6d-3,8d-3,
15 . 1d-2,1.4d-2,2d-2,3d-2,4d-2,6d-2,8d-2,
16 . .1d0,.125d0,.15d0,.175d0,.2d0,.225d0,.25d0,.275d0,
17 . .3d0,.325d0,.35d0,.375d0,.4d0,.425d0,.45d0,.475d0,
18 . .5d0,.525d0,.55d0,.575d0,.6d0,.65d0,.7d0,.75d0,
20 data qq/1.25d0,1.5d0,2d0,2.5d0,3.2d0,4d0,5d0,6.4d0,8d0,1d1,
21 . 1.2d1,1.8d1,2.6d1,4d1,6.4d1,1d2,
22 . 1.6d2,2.4d2,4d2,6.4d2,1d3,1.8d3,3.2d3,5.6d3,1d4,
23 . 1.8d4,3.2d4,5.6d4,1d5,1.8d5,3.2d5,5.6d5,1d6,
24 . 1.8d6,3.2d6,5.6d6,1d7/
25 data xmin,xmax,qsqmin,qsqmax/1d-5,1d0,1.25d0,1d7/
26 data n0/3,4,5,9,9,9,9,9/
35 if(qsq.lt.qsqmin) qsq=qsqmin
36 if(qsq.gt.qsqmax) qsq=qsqmax
39 if(x.lt.xx(ntenth)) xxx=dlog10(x/xx(ntenth))+xx(ntenth)
42 if(xxx.gt.xx(n+1)) goto 70
43 a=(xxx-xx(n))/(xx(n+1)-xx(n))
46 if(qsq.gt.qq(m+1)) goto 80
47 b=(qsq-qq(m))/(qq(m+1)-qq(m))
49 g(i)= (1d0-a)*(1d0-b)*f(imem,i,n,m)+(1d0-a)*b*f(imem,i,n,m+1)
50 . + a*(1d0-b)*f(imem,i,n+1,m)+a*b*f(imem,i,n+1,m+1)
51 if(n.ge.ntenth) goto 65
52 if(i.eq.5.or.i.eq.7) goto 65
53 fac=(1d0-b)*f(imem,i,ntenth,m)+b*f(imem,i,ntenth,m+1)
54 g(i)=fac*10d0**(g(i)-fac)
56 g(i)=g(i)*(1d0-x)**n0(i)
85 entry MRST98read(nset)
86 read(1,*)nmem(nset),ndef(nset)
87 c - first resotre the xx array
91 c - next read in the data points
95 read(1,50)f(nm,1,n,m),f(nm,2,n,m),f(nm,3,n,m),f(nm,4,n,m),
96 . f(nm,5,n,m),f(nm,7,n,m),f(nm,6,n,m),f(nm,8,n,m)
97 c notation: 1=uval 2=val 3=glue 4=usea 5=chm 6=str 7=btm 8=dsea
99 25 f(nm,i,n,m)=f(nm,i,n,m)/(1d0-xx(n))**n0(i)
101 c write(*,*)'PDF set ',nm,' first element ',f(nm,1,1,1)
103 c xx(j)=dlog10(xx(j)/xx(ntenth))+xx(ntenth)
105 if(i.eq.5.or.i.eq.7) goto 31
107 30 f(nm,i,j,k)=dlog10(f(nm,i,j,k)/f(nm,i,ntenth,k))
116 xx(j)=dlog10(xx(j)/xx(ntenth))+xx(ntenth)
120 entry MRST98alfa(alfas,Qalfa)
121 call alphamrs(5,alfas,Qalfa)
124 entry MRST98init(Eorder,Q2fit)
128 c if(mem.eq.0) mem=ndef