| 0caf84a5 |
1 | ! -*- F90 -*- |
| 2 | |
| 3 | |
| 4 | subroutine MRSTevolve(x,Q,pdf) |
| 5 | implicit real*8(a-h,o-z) |
| 6 | include 'parmsetup.inc' |
| 7 | character*16 name(nmxset) |
| 8 | character*80 line |
| 9 | character*512 setpath |
| 10 | integer nmem(nmxset),ndef(nmxset),mmem |
| 11 | ! integer member(nmxset) |
| 12 | integer nset,iset |
| 13 | common/NAME/name,nmem,ndef,mmem |
| 14 | parameter(nx=49,nq=37,np=8,nqc0=2,nqb0=11,nqc=35,nqb=26, & |
| 15 | &nhess=0) |
| 16 | real*8 pdf(-6:6) |
| 17 | real*8 f1(nx,nq) & |
| 18 | &,f2(nx,nq) & |
| 19 | &,f3(nx,nq) & |
| 20 | &,f4(nx,nq) & |
| 21 | &,f5(nx,nq) & |
| 22 | &,f6(nx,nq) & |
| 23 | &,f7(nx,nq) & |
| 24 | &,f8(nx,nq) & |
| 25 | &,fc(nx,nqc),fb(nx,nqb) |
| 26 | real*8 qq(nq),xx(nx), & |
| 27 | &cc1(0:nhess,nx,nq,4,4,nmxset),cc2(0:nhess,nx,nq,4,4,nmxset), & |
| 28 | &cc3(0:nhess,nx,nq,4,4,nmxset),cc4(0:nhess,nx,nq,4,4,nmxset), & |
| 29 | &cc6(0:nhess,nx,nq,4,4,nmxset),cc8(0:nhess,nx,nq,4,4,nmxset), & |
| 30 | &ccc(0:nhess,nx,nqc,4,4,nmxset),ccb(0:nhess,nx,nqb,4,4,nmxset) |
| 31 | real*8 xxl(nx),qql(nq),qqlc(nqc),qqlb(nqb) |
| 32 | data xx/1d-5,2d-5,4d-5,6d-5,8d-5, & |
| 33 | & 1d-4,2d-4,4d-4,6d-4,8d-4, & |
| 34 | & 1d-3,2d-3,4d-3,6d-3,8d-3, & |
| 35 | & 1d-2,1.4d-2,2d-2,3d-2,4d-2,6d-2,8d-2, & |
| 36 | & .1d0,.125d0,.15d0,.175d0,.2d0,.225d0,.25d0,.275d0, & |
| 37 | & .3d0,.325d0,.35d0,.375d0,.4d0,.425d0,.45d0,.475d0, & |
| 38 | & .5d0,.525d0,.55d0,.575d0,.6d0,.65d0,.7d0,.75d0, & |
| 39 | & .8d0,.9d0,1d0/ |
| 40 | data qq/1.25d0,1.5d0,2d0,2.5d0,3.2d0,4d0,5d0,6.4d0,8d0,1d1, & |
| 41 | & 1.2d1,1.8d1,2.6d1,4d1,6.4d1,1d2, & |
| 42 | & 1.6d2,2.4d2,4d2,6.4d2,1d3,1.8d3,3.2d3,5.6d3,1d4, & |
| 43 | & 1.8d4,3.2d4,5.6d4,1d5,1.8d5,3.2d5,5.6d5,1d6, & |
| 44 | & 1.8d6,3.2d6,5.6d6,1d7/ |
| 45 | data xmin,xmax,qsqmin,qsqmax/1d-5,1d0,1.25d0,1d7/ |
| 46 | save |
| 47 | |
| 48 | xsave=x |
| 49 | qsq = q*q |
| 50 | q2save=qsq |
| 51 | |
| 52 | xlog=dlog(x) |
| 53 | qsqlog=dlog(qsq) |
| 54 | |
| 55 | call getnset(iset) |
| 56 | ! imem=member(iset) |
| 57 | call getnmem(iset,imem) |
| 58 | |
| 59 | ! G.W. 24/04/2008 |
| 60 | if (qsq.lt.qsqmin) then |
| 61 | qsqlog=dlog(1.01D0*qsqmin) |
| 62 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 63 | & cc1(0,1,1,1,1,iset),upv1) |
| 64 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 65 | & cc2(0,1,1,1,1,iset),dnv1) |
| 66 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 67 | & cc3(0,1,1,1,1,iset),glu1) |
| 68 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 69 | & cc4(0,1,1,1,1,iset),usea1) |
| 70 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 71 | & cc6(0,1,1,1,1,iset),str1) |
| 72 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 73 | & cc8(0,1,1,1,1,iset),dsea1) |
| 74 | qsqlog=dlog(qsqmin) |
| 75 | end if |
| 76 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 77 | &cc1(0,1,1,1,1,iset),upv) |
| 78 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 79 | &cc2(0,1,1,1,1,iset),dnv) |
| 80 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 81 | &cc3(0,1,1,1,1,iset),glu) |
| 82 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 83 | &cc4(0,1,1,1,1,iset),usea) |
| 84 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 85 | &cc6(0,1,1,1,1,iset),str) |
| 86 | call jeppe2(0,xlog,qsqlog,nx,nq,xxl,qql, & |
| 87 | &cc8(0,1,1,1,1,iset),dsea) |
| 88 | ! G.W. 24/04/2008 |
| 89 | if (qsq.lt.qsqmin) then |
| 90 | !-- Calculate the anomalous dimension, dlog(xf)/dlog(qsq), |
| 91 | !-- evaluated at qsqmin. Then extrapolate the PDFs to low |
| 92 | !-- qsq < qsqmin by interpolating the anomalous dimenion between |
| 93 | !-- the value at qsqmin and a value of 1 for qsq << qsqmin. |
| 94 | !-- If value of PDF at qsqmin is very small, just set |
| 95 | !-- anomalous dimension to 1 to prevent rounding errors. |
| 96 | anom = (upv1-upv)/upv/0.01D0 |
| 97 | if (abs(upv).lt.1.D-4) anom = 1.D0 |
| 98 | upv = upv*(qsq/qsqmin)**(anom*qsq/qsqmin+1.D0-qsq/qsqmin) |
| 99 | anom = (dnv1-dnv)/dnv/0.01D0 |
| 100 | if (abs(dnv).lt.1.D-4) anom = 1.D0 |
| 101 | dnv = dnv*(qsq/qsqmin)**(anom*qsq/qsqmin+1.D0-qsq/qsqmin) |
| 102 | anom = (glu1-glu)/glu/0.01D0 |
| 103 | if (abs(glu).lt.1.D-4) anom = 1.D0 |
| 104 | glu = glu*(qsq/qsqmin)**(anom*qsq/qsqmin+1.D0-qsq/qsqmin) |
| 105 | anom = (usea1-usea)/usea/0.01D0 |
| 106 | if (abs(usea).lt.1.D-4) anom = 1.D0 |
| 107 | usea = usea*(qsq/qsqmin)**(anom*qsq/qsqmin+1.D0-qsq/qsqmin) |
| 108 | anom = (str1-str)/str/0.01D0 |
| 109 | if (abs(str).lt.1.D-4) anom = 1.D0 |
| 110 | str = str*(qsq/qsqmin)**(anom*qsq/qsqmin+1.D0-qsq/qsqmin) |
| 111 | anom = (dsea1-dsea)/dsea/0.01D0 |
| 112 | if (abs(dsea).lt.1.D-4) anom = 1.D0 |
| 113 | dsea = dsea*(qsq/qsqmin)**(anom*qsq/qsqmin+1.D0-qsq/qsqmin) |
| 114 | end if |
| 115 | |
| 116 | |
| 117 | |
| 118 | chm=0.d0 |
| 119 | if(qsq.gt.emc2) then |
| 120 | call jeppe2(0,xlog,qsqlog,nx,nqc,xxl,qqlc, & |
| 121 | &ccc(0,1,1,1,1,iset),chm) |
| 122 | endif |
| 123 | |
| 124 | bot=0.d0 |
| 125 | if(qsq.gt.emb2) then |
| 126 | call jeppe2(0,xlog,qsqlog,nx,nqb,xxl,qqlb, & |
| 127 | &ccb(0,1,1,1,1,iset),bot) |
| 128 | endif |
| 129 | |
| 130 | pdf(0) = glu |
| 131 | pdf(1) = dnv+dsea |
| 132 | pdf(-1) = dsea |
| 133 | pdf(2) = upv+usea |
| 134 | pdf(-2) = usea |
| 135 | pdf(3) = str |
| 136 | pdf(-3) = str |
| 137 | pdf(4) = chm |
| 138 | pdf(-4) = chm |
| 139 | pdf(5) = bot |
| 140 | pdf(-5) = bot |
| 141 | pdf(6) = 0.0d0 |
| 142 | pdf(-6) = 0.0d0 |
| 143 | |
| 144 | x=xsave |
| 145 | qsq=q2save |
| 146 | return |
| 147 | ! |
| 148 | entry MRSTread(nset) |
| 149 | ! - dummy read in to get to End: (stream 1 is still open) |
| 150 | read(1,*)nmem(nset),ndef(nset) |
| 151 | |
| 152 | do i=0,nmem(nset) |
| 153 | do n=1,nx-1 |
| 154 | do m=1,nq |
| 155 | read(1,'(a)'),line |
| 156 | enddo |
| 157 | enddo |
| 158 | enddo |
| 159 | |
| 160 | do n=1,nx |
| 161 | xxl(n)=dlog(xx(n)) |
| 162 | enddo |
| 163 | do m=1,nq |
| 164 | qql(m)=dlog(qq(m)) |
| 165 | enddo |
| 166 | return |
| 167 | ! |
| 168 | |
| 169 | entry MRSTalfa(nflav,alfas,Qalfa) |
| 170 | call getnset(iset) |
| 171 | ! mem = member(iset) |
| 172 | ! call setnmem(member(iset)) |
| 173 | call alphamrs(nflav,alfas,Qalfa) |
| 174 | return |
| 175 | ! |
| 176 | entry MRSTinit(Eorder,Q2fit) |
| 177 | return |
| 178 | ! |
| 179 | entry MRSTpdf(mem) |
| 180 | ! if(mem.eq.0) mem=ndef |
| 181 | ! imem = mem |
| 182 | call getnset(iset) |
| 183 | ! member(iset)=mem |
| 184 | call setnmem(iset,mem) |
| 185 | |
| 186 | ! have to reopen stream 1 |
| 187 | call getsetpath(setpath) |
| 188 | open(1,file=setpath(1:len_trim(setpath))) |
| 189 | line = '' |
| 190 | do while (line(2:11).ne.'Evolution:') |
| 191 | read(1,'(a)'),line |
| 192 | enddo |
| 193 | read(1,'(a)'),line |
| 194 | read(1,'(a)'),line |
| 195 | |
| 196 | read(1,*)nmem(iset),ndef(iset) |
| 197 | |
| 198 | ! - dummy read up to the member requested |
| 199 | do i=0,mem-1 |
| 200 | do n=1,nx-1 |
| 201 | do m=1,nq |
| 202 | read(1,'(a)')line |
| 203 | enddo |
| 204 | enddo |
| 205 | enddo |
| 206 | |
| 207 | |
| 208 | !- read in the data of the requested member |
| 209 | do 20 n=1,nx-1 |
| 210 | do 20 m=1,nq |
| 211 | read(1,50)f1(n,m),f2(n,m),f3(n,m),f4(n,m), & |
| 212 | & f5(n,m),f7(n,m),f6(n,m),f8(n,m) |
| 213 | ! notation: 1=uval 2=val 3=glue 4=usea 5=chm 6=str 7=btm 8=dsea |
| 214 | 20 continue |
| 215 | ! write(*,*)'PDF set ',nm,' first element ',f1(1,1) |
| 216 | |
| 217 | do 40 m=1,nq |
| 218 | f1(nx,m)=0.d0 |
| 219 | f2(nx,m)=0.d0 |
| 220 | f3(nx,m)=0.d0 |
| 221 | f4(nx,m)=0.d0 |
| 222 | f5(nx,m)=0.d0 |
| 223 | f6(nx,m)=0.d0 |
| 224 | f7(nx,m)=0.d0 |
| 225 | f8(nx,m)=0.d0 |
| 226 | 40 continue |
| 227 | |
| 228 | call jeppe1(0,nx,nq,xxl,qql,f1,cc1(0,1,1,1,1,iset)) |
| 229 | call jeppe1(0,nx,nq,xxl,qql,f2,cc2(0,1,1,1,1,iset)) |
| 230 | call jeppe1(0,nx,nq,xxl,qql,f3,cc3(0,1,1,1,1,iset)) |
| 231 | call jeppe1(0,nx,nq,xxl,qql,f4,cc4(0,1,1,1,1,iset)) |
| 232 | call jeppe1(0,nx,nq,xxl,qql,f6,cc6(0,1,1,1,1,iset)) |
| 233 | call jeppe1(0,nx,nq,xxl,qql,f8,cc8(0,1,1,1,1,iset)) |
| 234 | |
| 235 | emc2=2.045 |
| 236 | emb2=18.5 |
| 237 | |
| 238 | do 44 m=1,nqc |
| 239 | qqlc(m)=qql(m+nqc0) |
| 240 | do 44 n=1,nx |
| 241 | fc(n,m)=f5(n,m+nqc0) |
| 242 | 44 continue |
| 243 | qqlc(1)=dlog(emc2) |
| 244 | call jeppe1(0,nx,nqc,xxl,qqlc,fc,ccc(0,1,1,1,1,iset)) |
| 245 | |
| 246 | do 45 m=1,nqb |
| 247 | qqlb(m)=qql(m+nqb0) |
| 248 | do 45 n=1,nx |
| 249 | fb(n,m)=f7(n,m+nqb0) |
| 250 | 45 continue |
| 251 | qqlb(1)=dlog(emb2) |
| 252 | call jeppe1(0,nx,nqb,xxl,qqlb,fb,ccb(0,1,1,1,1,iset)) |
| 253 | |
| 254 | close(1) |
| 255 | 50 format(8f10.5) |
| 256 | |
| 257 | |
| 258 | return |
| 259 | ! |
| 260 | END |
| 261 | |
| 262 | subroutine jeppe1(imem,nx,my,xx,yy,ff,cc) |
| 263 | implicit real*8(a-h,o-z) |
| 264 | parameter(nnx=49,mmy=37,nhess=0) |
| 265 | dimension xx(nx),yy(my),ff(nnx,mmy), & |
| 266 | &ff1(nnx,mmy),ff2(nnx,mmy), & |
| 267 | &ff12(nnx,mmy),yy0(4),yy1(4),yy2(4),yy12(4),z(16),wt(16,16), & |
| 268 | &cl(16),cc(0:nhess,nx,my,4,4),iwt(16,16) |
| 269 | |
| 270 | data iwt/1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, & |
| 271 | & 0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, & |
| 272 | & -3,0,0,3,0,0,0,0,-2,0,0,-1,0,0,0,0, & |
| 273 | & 2,0,0,-2,0,0,0,0,1,0,0,1,0,0,0,0, & |
| 274 | & 0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0, & |
| 275 | & 0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0, & |
| 276 | & 0,0,0,0,-3,0,0,3,0,0,0,0,-2,0,0,-1, & |
| 277 | & 0,0,0,0,2,0,0,-2,0,0,0,0,1,0,0,1, & |
| 278 | & -3,3,0,0,-2,-1,0,0,0,0,0,0,0,0,0,0, & |
| 279 | & 0,0,0,0,0,0,0,0,-3,3,0,0,-2,-1,0,0, & |
| 280 | & 9,-9,9,-9,6,3,-3,-6,6,-6,-3,3,4,2,1,2, & |
| 281 | & -6,6,-6,6,-4,-2,2,4,-3,3,3,-3,-2,-1,-1,-2, & |
| 282 | & 2,-2,0,0,1,1,0,0,0,0,0,0,0,0,0,0, & |
| 283 | & 0,0,0,0,0,0,0,0,2,-2,0,0,1,1,0,0, & |
| 284 | & -6,6,-6,6,-3,-3,3,3,-4,4,2,-2,-2,-2,-1,-1, & |
| 285 | & 4,-4,4,-4,2,2,-2,-2,2,-2,-2,2,1,1,1,1/ |
| 286 | |
| 287 | |
| 288 | do 42 m=1,my |
| 289 | dx=xx(2)-xx(1) |
| 290 | ff1(1,m)=(ff(2,m)-ff(1,m))/dx |
| 291 | dx=xx(nx)-xx(nx-1) |
| 292 | ff1(nx,m)=(ff(nx,m)-ff(nx-1,m))/dx |
| 293 | do 41 n=2,nx-1 |
| 294 | ff1(n,m)=polderiv(xx(n-1),xx(n),xx(n+1),ff(n-1,m),ff(n,m), & |
| 295 | &ff(n+1,m)) |
| 296 | 41 continue |
| 297 | 42 continue |
| 298 | |
| 299 | do 44 n=1,nx |
| 300 | dy=yy(2)-yy(1) |
| 301 | ff2(n,1)=(ff(n,2)-ff(n,1))/dy |
| 302 | dy=yy(my)-yy(my-1) |
| 303 | ff2(n,my)=(ff(n,my)-ff(n,my-1))/dy |
| 304 | do 43 m=2,my-1 |
| 305 | ff2(n,m)=polderiv(yy(m-1),yy(m),yy(m+1),ff(n,m-1),ff(n,m), & |
| 306 | &ff(n,m+1)) |
| 307 | 43 continue |
| 308 | 44 continue |
| 309 | |
| 310 | do 46 m=1,my |
| 311 | dx=xx(2)-xx(1) |
| 312 | ff12(1,m)=(ff2(2,m)-ff2(1,m))/dx |
| 313 | dx=xx(nx)-xx(nx-1) |
| 314 | ff12(nx,m)=(ff2(nx,m)-ff2(nx-1,m))/dx |
| 315 | do 45 n=2,nx-1 |
| 316 | ff12(n,m)=polderiv(xx(n-1),xx(n),xx(n+1),ff2(n-1,m),ff2(n,m), & |
| 317 | &ff2(n+1,m)) |
| 318 | 45 continue |
| 319 | 46 continue |
| 320 | |
| 321 | do 53 n=1,nx-1 |
| 322 | do 52 m=1,my-1 |
| 323 | d1=xx(n+1)-xx(n) |
| 324 | d2=yy(m+1)-yy(m) |
| 325 | d1d2=d1*d2 |
| 326 | |
| 327 | yy0(1)=ff(n,m) |
| 328 | yy0(2)=ff(n+1,m) |
| 329 | yy0(3)=ff(n+1,m+1) |
| 330 | yy0(4)=ff(n,m+1) |
| 331 | |
| 332 | yy1(1)=ff1(n,m) |
| 333 | yy1(2)=ff1(n+1,m) |
| 334 | yy1(3)=ff1(n+1,m+1) |
| 335 | yy1(4)=ff1(n,m+1) |
| 336 | |
| 337 | yy2(1)=ff2(n,m) |
| 338 | yy2(2)=ff2(n+1,m) |
| 339 | yy2(3)=ff2(n+1,m+1) |
| 340 | yy2(4)=ff2(n,m+1) |
| 341 | |
| 342 | yy12(1)=ff12(n,m) |
| 343 | yy12(2)=ff12(n+1,m) |
| 344 | yy12(3)=ff12(n+1,m+1) |
| 345 | yy12(4)=ff12(n,m+1) |
| 346 | |
| 347 | do 47 k=1,4 |
| 348 | z(k)=yy0(k) |
| 349 | z(k+4)=yy1(k)*d1 |
| 350 | z(k+8)=yy2(k)*d2 |
| 351 | z(k+12)=yy12(k)*d1d2 |
| 352 | 47 continue |
| 353 | |
| 354 | do 49 l=1,16 |
| 355 | xxd=0. |
| 356 | do 48 k=1,16 |
| 357 | xxd=xxd+iwt(k,l)*z(k) |
| 358 | 48 continue |
| 359 | cl(l)=xxd |
| 360 | 49 continue |
| 361 | l=0 |
| 362 | do 51 k=1,4 |
| 363 | do 50 j=1,4 |
| 364 | l=l+1 |
| 365 | cc(imem,n,m,k,j)=cl(l) |
| 366 | 50 continue |
| 367 | 51 continue |
| 368 | 52 continue |
| 369 | 53 continue |
| 370 | return |
| 371 | END |
| 372 | |
| 373 | subroutine jeppe2(i,x,y,nx,my,xx,yy,cc,z) |
| 374 | !-- G.W. 02/07/2007 Allow extrapolation to small x and large q. |
| 375 | implicit real*8(a-h,o-z) |
| 376 | parameter(nhess=0) |
| 377 | dimension xx(nx),yy(my),cc(0:nhess,nx,my,4,4) |
| 378 | |
| 379 | n=locx(xx,nx,x) |
| 380 | m=locx(yy,my,y) |
| 381 | |
| 382 | if (n.gt.0.and.n.lt.nx.and.m.gt.0.and.m.lt.my) then |
| 383 | !-- Do usual interpolation. |
| 384 | t=(x-xx(n))/(xx(n+1)-xx(n)) |
| 385 | u=(y-yy(m))/(yy(m+1)-yy(m)) |
| 386 | z=0.d0 |
| 387 | do l=4,1,-1 |
| 388 | z=t*z+((cc(i,n,m,l,4)*u+cc(i,n,m,l,3))*u & |
| 389 | & +cc(i,n,m,l,2))*u+cc(i,n,m,l,1) |
| 390 | enddo |
| 391 | |
| 392 | else if (n.eq.0.and.m.gt.0.and.m.lt.my) then |
| 393 | !-- Extrapolate to small x. |
| 394 | call jeppe3(i,xx(1),y,nx,my,xx,yy,cc,f0) |
| 395 | call jeppe3(i,xx(2),y,nx,my,xx,yy,cc,f1) |
| 396 | if (f0.gt.0.d0.and.f1.gt.0.d0) then |
| 397 | z = exp(log(f0)+(log(f1)-log(f0))/(xx(2)-xx(1))*(x-xx(1))) |
| 398 | else |
| 399 | z = f0+(f1-f0)/(xx(2)-xx(1))*(x-xx(1)) |
| 400 | end if |
| 401 | |
| 402 | else if (n.gt.0.and.m.eq.my) then |
| 403 | !-- Extrapolate to large q. |
| 404 | call jeppe3(i,x,yy(my),nx,my,xx,yy,cc,f0) |
| 405 | call jeppe3(i,x,yy(my-1),nx,my,xx,yy,cc,f1) |
| 406 | if (f0.gt.0.d0.and.f1.gt.0.d0) then |
| 407 | z = exp(log(f0)+(log(f0)-log(f1))/(yy(my)-yy(my-1))* & |
| 408 | & (y-yy(my))) |
| 409 | else |
| 410 | z = f0+(f0-f1)/(yy(my)-yy(my-1))*(y-yy(my)) |
| 411 | end if |
| 412 | |
| 413 | else if (n.eq.0.and.m.eq.my) then |
| 414 | !-- Extrapolate to small x AND large q. |
| 415 | call jeppe3(i,xx(1),yy(my),nx,my,xx,yy,cc,f0) |
| 416 | call jeppe3(i,xx(1),yy(my-1),nx,my,xx,yy,cc,f1) |
| 417 | if (f0.gt.0.d0.and.f1.gt.0.d0) then |
| 418 | z0 = exp(log(f0)+(log(f0)-log(f1))/(yy(my)-yy(my-1))* & |
| 419 | & (y-yy(my))) |
| 420 | else |
| 421 | z0 = f0+(f0-f1)/(yy(my)-yy(my-1))*(y-yy(my)) |
| 422 | end if |
| 423 | call jeppe3(i,xx(2),yy(my),nx,my,xx,yy,cc,f0) |
| 424 | call jeppe3(i,xx(2),yy(my-1),nx,my,xx,yy,cc,f1) |
| 425 | if (f0.gt.0.d0.and.f1.gt.0.d0) then |
| 426 | z1 = exp(log(f0)+(log(f0)-log(f1))/(yy(my)-yy(my-1))* & |
| 427 | & (y-yy(my))) |
| 428 | else |
| 429 | z1 = f0+(f0-f1)/(yy(my)-yy(my-1))*(y-yy(my)) |
| 430 | end if |
| 431 | if (z0.gt.0.d0.and.z1.gt.0.d0) then |
| 432 | z = exp(log(z0)+(log(z1)-log(z0))/(xx(2)-xx(1))*(x-xx(1))) |
| 433 | else |
| 434 | z = z0+(z1-z0)/(xx(2)-xx(1))*(x-xx(1)) |
| 435 | end if |
| 436 | |
| 437 | else |
| 438 | !-- Set parton distribution to zero otherwise. |
| 439 | z = 0.d0 |
| 440 | |
| 441 | end if |
| 442 | |
| 443 | return |
| 444 | END |
| 445 | |
| 446 | !-- G.W. 02/07/2007 Copy of the original jeppe2, |
| 447 | !-- only used for extrapolation. |
| 448 | subroutine jeppe3(i,x,y,nx,my,xx,yy,cc,z) |
| 449 | implicit real*8(a-h,o-z) |
| 450 | parameter(nhess=0) |
| 451 | dimension xx(nx),yy(my),cc(0:nhess,nx,my,4,4) |
| 452 | n=locx(xx,nx,x) |
| 453 | m=locx(yy,my,y) |
| 454 | t=(x-xx(n))/(xx(n+1)-xx(n)) |
| 455 | u=(y-yy(m))/(yy(m+1)-yy(m)) |
| 456 | z=0.d0 |
| 457 | do l=4,1,-1 |
| 458 | z=t*z+((cc(i,n,m,l,4)*u+cc(i,n,m,l,3))*u & |
| 459 | & +cc(i,n,m,l,2))*u+cc(i,n,m,l,1) |
| 460 | enddo |
| 461 | return |
| 462 | END |
| 463 | |
| 464 | integer function locx(xx,nx,x) |
| 465 | implicit real*8(a-h,o-z) |
| 466 | dimension xx(nx) |
| 467 | !$$$ if(x.le.xx(1)) then |
| 468 | ! G.W. 02/07/2007 |
| 469 | if(x.eq.xx(1)) then |
| 470 | locx=1 |
| 471 | return |
| 472 | endif |
| 473 | !$$$ if(x.ge.xx(nx)) then |
| 474 | ! G.W. 02/07/2007 |
| 475 | if(x.eq.xx(nx)) then |
| 476 | locx=nx-1 |
| 477 | return |
| 478 | endif |
| 479 | ju=nx+1 |
| 480 | jl=0 |
| 481 | 1 if((ju-jl).le.1) go to 2 |
| 482 | jm=(ju+jl)/2 |
| 483 | if(x.ge.xx(jm)) then |
| 484 | jl=jm |
| 485 | else |
| 486 | ju=jm |
| 487 | endif |
| 488 | go to 1 |
| 489 | 2 locx=jl |
| 490 | return |
| 491 | END |
| 492 | |
| 493 | real*8 function polderiv(x1,x2,x3,y1,y2,y3) |
| 494 | implicit real*8(a-h,o-z) |
| 495 | polderiv=(x3*x3*(y1-y2)-2.0*x2*(x3*(y1-y2)+x1* & |
| 496 | &(y2-y3))+x2*x2*(y1-y3)+x1*x1*(y2-y3))/((x1-x2)*(x1-x3)*(x2-x3)) |
| 497 | return |
| 498 | END |
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