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	积分5491贡献 精华在线时间 小时注册时间2013-7-18最后登录1970-1-1 
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刚开始上手做毕业论文,老师说要对OLR的逐日资料做10-90天的滤波,我一窍不通,找来了一段fortran程序,我看不大懂,自己改了主程序并尝试运行多次,出来的结果都是NaN,是不是子程序运算的有错,以为子程序我实在看不懂,希望会的同学老师们提供帮助。底下是程序:
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  program mian
 parameter(nx=72,ny=32,nt=5202,freqL=1/90.,freqU=1/10.)
 
 dimension olr(nx,ny,nt)
 dimension r2(nx,ny,nt)
 dimension mid(nx,ny,nt)
 dimension olrf(nx,ny,nt)
 !      complex r1(nt),work(nt)
 real r1(nt),work(nt)
 
 OPEN(11,FILE='olr.79-12.6-10.grd',FORM='BINARY')
 PRINT*,'NOW READING ...'
 DO IT=1,NT
 DO J=1,NY
 DO I=1,NX
 READ(11) olr(I,J,IT)
 ENDDO
 ENDDO
 enddo
 close(11)
 
 
 do it=1,nt
 do j=1,ny
 do i=1,nx
 mid(i,j,it)=olr(i,j,it)
 enddo
 enddo
 enddo
 
 do 111 i=1,nx
 do 111 j=1,ny
 do 50 k=1,nt
 r1(k)=mid(i,j,k)
 50   continue
 call bandps(nt,r1,1.,freqL,freqU,0,work)
 do 60 k=1,nt
 r2(i,j,k)=real(r1(k))
 60   continue
 111   continue
 do k=1,nt
 do j=1,ny
 do i=1,nx
 olrf(i,j,k)=r2(i,j,k)
 enddo
 enddo
 enddo
 
 
 
 OPEN(12,FILE='bp-filtered-olr.grd',FORM='BINARY')
 PRINT*,'NOW WRITING ...'
 do k=1,nt
 do j=1,ny
 do i=1,nx
 if(abs(olrf(i,j,k))>5000.0) then
 olrf(i,j,k)=-9999
 write(12) olrf(i,j,k)
 else
 write(12) olrf(i,j,k)
 endif
 enddo
 enddo
 enddo
 close(12)
 print*,'NOW COMPLETED!'
 
 stop
 end
 
 subroutine bandps (npts, ts, dt, freqL, freqU, iform, work)
 integer  npts, iform
 real     dt, freqL, freqU
 !  complex  ts(npts), work(npts)
 real  ts(npts), work(npts)
 integer  j, jL, jU
 if (iform .lt. 0 .or. iform .gt. 1)
 x   stop 'BANDPS: iform is out of range.'
 
 jL = int(freqL*dt*npts + 0.5) + 1
 if(freqL .lt. 0) jL=-int(-freqL*dt*npts + 0.5)+1
 c
 jU = int(freqU*dt*npts + 0.5) + 1
 if(freqU .lt. 0) jU=-int(-freqU*dt*npts + 0.5)+1
 c
 c     If iform = 0, freqL and/or freqU are unsuitable if freqL .lt. 0,
 c     freqU .lt. freqL, and/or freqU .gt. 1/(2*dt).
 if (iform .eq. 0  .and.
 x   (jL .lt. 1  .or.  jU .lt. jL  .or.  jU .gt. 1 + npts/2))
 x   stop 'BANDPS: freqL and/or freqU are out of range.'
 c
 c     If iform = 1, freqL and/or freqU are unsuitable if
 c     freqL .lt. -1/(2*dt), freqU .lt. freqL, and/or freqU .gt. 1/dt.
 if (iform .eq. 1  .and.
 x   (jL .lt. 1-npts/2  .or.  jU .lt. jL  .or.  jU .gt. npts))
 x   stop 'BANDPS: freqL and/or freqU are out of range.'
 
 
 c
 c-----
 c Fourier transform the complex time series.
 call fourt (ts, npts, 1, -1, iform, work)
 c
 c     Normalize the transform so that the values represent
 c     wave amplitudes.
 do 10 j  = 1, npts
 ts(j) = ts(j)/npts
 10 continue
 
 
 c
 c-----
 c Apply the frequency filter.
 c     Ordinates indexed by jL through jU, inclusive, will be retained.
 c     All other ordinates will be set to zero.
 if(jL .le. 0 .and. jU .ge. 1) then
 do 30 j  = jU+1, jL+npts-1, 1
 ts(j) = 0.0
 30    continue
 else
 c        This covers the case (jL.le.0 .and. jU.le.0)
 c        .or. (jL.ge.1 .and. jU.ge.1).
 if (jL .le. 0) then
 jL = jL + npts
 jU = jU + npts
 endif
 do 130 j  = 1, jL-1, 1
 ts (j) = 0.0
 130    continue
 if (iform .eq. 0) then
 c           The time series is real (the imaginary part is zero),
 c           so we want to retain both frequency ranges (-freqU, -freqL)
 c           and (freqL, freqU) so that the inverse transform
 c           will also be real.
 do 150 j  = jU+1, npts+1-jU, 1
 ts (j) = 0.0
 150       continue
 do 160 j  = npts+3-jL, npts, 1
 ts (j) = 0.0
 160       continue
 else
 c           The time series is complex, so we want to retain only the
 c           frequency range (freqL, freqU).
 do 180 j  = jU+1, npts, 1
 ts (j) = 0.0
 180       continue
 endif
 endif
 c
 c-----
 c Compute the inverse transform.
 call fourt (ts, npts, 1, 1, 1, work)
 
 return
 end
 
 
 *********************************************
 subroutine undefin(rain,nx,ny,nt)
 real rain(nx,ny,nt)
 
 do 21 k=1,nt
 do 20 j=1,ny
 do 20 i=1,nx
 
 if(rain(i,j,k).lt.0.0)then
 rain(i,j,k)=-9999
 endif
 
 20    continue
 21    continue
 
 return
 end
 
 
 *********************************************
 subroutine fourt (data, nn, ndim, isign, iform, work)
 real  data(*), work(*)
 integer  nn(*),   ifact(32)
 data twopi/6.2831853071796/,rthlf/0.70710678118655/
 c     twopi = 2 pi, rthlf = sqrt(1./2.)
 c
 c     Check input parameters for propriety.  Return if non-positive
 c     dimensions are encountered.
 if(ndim-1)920,1,1
 1     ntot=2
 do 2 idim=1,ndim
 if(nn(idim))920,920,2
 2     ntot=ntot*nn(idim)
 np1=2
 do 910 idim=1,ndim
 n=nn(idim)
 np2=np1*n
 if(n-1)920,900,5
 c
 
 5     m=n
 ntwo=np1
 if=1
 idiv=2
 10    iquot=m/idiv
 irem=m-idiv*iquot
 if(iquot-idiv)50,11,11
 11    if(irem)20,12,20
 12    ntwo=ntwo+ntwo
 ifact(if)=idiv
 if=if+1
 m=iquot
 go to 10
 20    idiv=3
 inon2=if
 30    iquot=m/idiv
 irem=m-idiv*iquot
 if(iquot-idiv)60,31,31
 31    if(irem)40,32,40
 32    ifact(if)=idiv
 if=if+1
 m=iquot
 go to 30
 40    idiv=idiv+2
 go to 30
 50    inon2=if
 if(irem)60,51,60
 51    ntwo=ntwo+ntwo
 go to 70
 60    ifact(if)=m
 c
 c
 70    icase=1
 ifmin=1
 i1rng=np1
 if(idim-4)71,100,100
 71    if(iform)72,72,100
 72    icase=2
 i1rng=npo*(1+nprev/2)
 if(idim-1)73,73,100
 73    icase=3
 i1rng=np1
 if(ntwo-np1)100,100,74
 74    icase=4
 ifmin=2
 ntwo=ntwo/2
 n=n/2
 np2=np2/2
 ntot=ntot/2
 i=1
 do 80 j=1,ntot
 data(j)=data(i)
 80    i=i+2
 c
 c
 100   if(ntwo-np2)200,110,110
 110   np2hf=np2/2
 j=1
 do 150 i2=1,np2,np1
 if(j-i2)120,130,130
 120   i1max=i2+np1-2
 do 125 i1=i2,i1max,2
 do 125 i3=i1,ntot,np2
 j3=j+i3-i2
 tempr=data(i3)
 tempi=data(i3+1)
 data(i3)=data(j3)
 data(i3+1)=data(j3+1)
 data(j3)=tempr
 125   data(j3+1)=tempi
 130   m=np2hf
 140   if(j-m)150,150,145
 145   j=j-m
 m=m/2
 if(m-np1)150,140,140
 150   j=j+m
 go to 300
 c
 
 200   nwork=2*n
 do 270 i1=1,np1,2
 do 270 i3=i1,ntot,np2
 j=i3
 do 260 i=1,nwork,2
 if(icase-3)210,220,210
 210   work(i)=data(j)
 work(i+1)=data(j+1)
 go to 230
 220   work(i)=data(j)
 work(i+1)=0.
 230   ifp2=np2
 if=ifmin
 240   ifp1=ifp2/ifact(if)
 j=j+ifp1
 if(j-i3-ifp2)260,250,250
 250   j=j-ifp2
 ifp2=ifp1
 if=if+1
 if(ifp2-np1)260,260,240
 260   continue
 i2max=i3+np2-np1
 i=1
 do 270 i2=i3,i2max,np1
 data(i2)=work(i)
 data(i2+1)=work(i+1)
 270   i=i+2
 c
 
 300   if(ntwo-np1)600,600,305
 305   np1tw=np1+np1
 ipar=ntwo/np1
 310   if(ipar-2)350,330,320
 320   ipar=ipar/4
 go to 310
 330   do 340 i1=1,i1rng,2
 do 340 k1=i1,ntot,np1tw
 k2=k1+np1
 tempr=data(k2)
 tempi=data(k2+1)
 data(k2)=data(k1)-tempr
 data(k2+1)=data(k1+1)-tempi
 data(k1)=data(k1)+tempr
 340   data(k1+1)=data(k1+1)+tempi
 350   mmax=np1
 360   if(mmax-ntwo/2)370,600,600
 370   lmax=max0(np1tw,mmax/2)
 do 570 l=np1,lmax,np1tw
 m=l
 if(mmax-np1)420,420,380
 380   theta=-twopi*float(l)/float(4*mmax)
 if(isign)400,390,390
 390   theta=-theta
 400   wr=cos(theta)
 wi=sin(theta)
 410   w2r=wr*wr-wi*wi
 w2i=2.*wr*wi
 w3r=w2r*wr-w2i*wi
 w3i=w2r*wi+w2i*wr
 420   do 530 i1=1,i1rng,2
 kmin=i1+ipar*m
 if(mmax-np1)430,430,440
 430   kmin=i1
 440   kdif=ipar*mmax
 450   kstep=4*kdif
 if(kstep-ntwo)460,460,530
 460   do 520 k1=kmin,ntot,kstep
 k2=k1+kdif
 k3=k2+kdif
 k4=k3+kdif
 if(mmax-np1)470,470,480
 470   u1r=data(k1)+data(k2)
 u1i=data(k1+1)+data(k2+1)
 u2r=data(k3)+data(k4)
 u2i=data(k3+1)+data(k4+1)
 u3r=data(k1)-data(k2)
 u3i=data(k1+1)-data(k2+1)
 if(isign)471,472,472
 471   u4r=data(k3+1)-data(k4+1)
 u4i=data(k4)-data(k3)
 go to 510
 472   u4r=data(k4+1)-data(k3+1)
 u4i=data(k3)-data(k4)
 go to 510
 480   t2r=w2r*data(k2)-w2i*data(k2+1)
 t2i=w2r*data(k2+1)+w2i*data(k2)
 t3r=wr*data(k3)-wi*data(k3+1)
 t3i=wr*data(k3+1)+wi*data(k3)
 t4r=w3r*data(k4)-w3i*data(k4+1)
 t4i=w3r*data(k4+1)+w3i*data(k4)
 u1r=data(k1)+t2r
 u1i=data(k1+1)+t2i
 u2r=t3r+t4r
 u2i=t3i+t4i
 u3r=data(k1)-t2r
 u3i=data(k1+1)-t2i
 if(isign)490,500,500
 490   u4r=t3i-t4i
 u4i=t4r-t3r
 go to 510
 500   u4r=t4i-t3i
 u4i=t3r-t4r
 510   data(k1)=u1r+u2r
 data(k1+1)=u1i+u2i
 data(k2)=u3r+u4r
 data(k2+1)=u3i+u4i
 data(k3)=u1r-u2r
 data(k3+1)=u1i-u2i
 data(k4)=u3r-u4r
 520   data(k4+1)=u3i-u4i
 kdif=kstep
 kmin=4*(kmin-i1)+i1
 go to 450
 530   continue
 m=m+lmax
 if(m-mmax)540,540,570
 540   if(isign)550,560,560
 550   tempr=wr
 wr=(wr+wi)*rthlf
 wi=(wi-tempr)*rthlf
 go to 410
 560   tempr=wr
 wr=(wr-wi)*rthlf
 wi=(tempr+wi)*rthlf
 go to 410
 570   continue
 ipar=3-ipar
 mmax=mmax+mmax
 go to 360
 c
 c
 600   if(ntwo-np2)605,700,700
 605   ifp1=ntwo
 if=inon2
 np1hf=np1/2
 610   ifp2=ifact(if)*ifp1
 j1min=np1+1
 if(j1min-ifp1)615,615,640
 615   do 635 j1=j1min,ifp1,np1
 theta=-twopi*float(j1-1)/float(ifp2)
 if(isign)625,620,620
 620   theta=-theta
 625   wstpr=cos(theta)
 wstpi=sin(theta)
 wr=wstpr
 wi=wstpi
 j2min=j1+ifp1
 j2max=j1+ifp2-ifp1
 do 635 j2=j2min,j2max,ifp1
 i1max=j2+i1rng-2
 do 630 i1=j2,i1max,2
 do 630 j3=i1,ntot,ifp2
 tempr=data(j3)
 data(j3)=data(j3)*wr-data(j3+1)*wi
 630   data(j3+1)=tempr*wi+data(j3+1)*wr
 tempr=wr
 wr=wr*wstpr-wi*wstpi
 635   wi=tempr*wstpi+wi*wstpr
 640   theta=-twopi/float(ifact(if))
 if(isign)650,645,645
 645   theta=-theta
 650   wstpr=cos(theta)
 wstpi=sin(theta)
 j2rng=ifp1*(1+ifact(if)/2)
 do 695 i1=1,i1rng,2
 do 695 i3=i1,ntot,np2
 j2max=i3+j2rng-ifp1
 do 690 j2=i3,j2max,ifp1
 j1max=j2+ifp1-np1
 do 680 j1=j2,j1max,np1
 j3max=j1+np2-ifp2
 do 680 j3=j1,j3max,ifp2
 jmin=j3-j2+i3
 jmax=jmin+ifp2-ifp1
 i=1+(j3-i3)/np1hf
 if(j2-i3)655,655,665
 655   sumr=0.
 sumi=0.
 do 660 j=jmin,jmax,ifp1
 sumr=sumr+data(j)
 660   sumi=sumi+data(j+1)
 work(i)=sumr
 work(i+1)=sumi
 go to 680
 665   iconj=1+(ifp2-2*j2+i3+j3)/np1hf
 j=jmax
 sumr=data(j)
 sumi=data(j+1)
 oldsr=0.
 oldsi=0.
 j=j-ifp1
 670   tempr=sumr
 tempi=sumi
 sumr=twowr*sumr-oldsr+data(j)
 sumi=twowr*sumi-oldsi+data(j+1)
 oldsr=tempr
 oldsi=tempi
 j=j-ifp1
 if(j-jmin)675,675,670
 675   tempr=wr*sumr-oldsr+data(j)
 tempi=wi*sumi
 work(i)=tempr-tempi
 work(iconj)=tempr+tempi
 tempr=wr*sumi-oldsi+data(j+1)
 tempi=wi*sumr
 work(i+1)=tempr+tempi
 work(iconj+1)=tempr-tempi
 680   continue
 if(j2-i3)685,685,686
 685   wr=wstpr
 wi=wstpi
 go to 690
 686   tempr=wr
 wr=wr*wstpr-wi*wstpi
 wi=tempr*wstpi+wi*wstpr
 690   twowr=wr+wr
 i=1
 i2max=i3+np2-np1
 do 695 i2=i3,i2max,np1
 data(i2)=work(i)
 data(i2+1)=work(i+1)
 695   i=i+2
 if=if+1
 ifp1=ifp2
 if(ifp1-np2)610,700,700
 c
 c
 700   go to (900,800,900,701),icase
 701   nhalf=n
 n=n+n
 theta=-twopi/float(n)
 if(isign)703,702,702
 702   theta=-theta
 703   wstpr=cos(theta)
 wstpi=sin(theta)
 wr=wstpr
 wi=wstpi
 imin=3
 jmin=2*nhalf-1
 go to 725
 710   j=jmin
 do 720 i=imin,ntot,np2
 sumr=(data(i)+data(j))/2.
 sumi=(data(i+1)+data(j+1))/2.
 difr=(data(i)-data(j))/2.
 difi=(data(i+1)-data(j+1))/2.
 tempr=wr*sumi+wi*difr
 tempi=wi*sumi-wr*difr
 data(i)=sumr+tempr
 data(i+1)=difi+tempi
 data(j)=sumr-tempr
 data(j+1)=-difi+tempi
 720   j=j+np2
 imin=imin+2
 jmin=jmin-2
 tempr=wr
 wr=wr*wstpr-wi*wstpi
 wi=tempr*wstpi+wi*wstpr
 725   if(imin-jmin)710,730,740
 730   if(isign)731,740,740
 731   do 735 i=imin,ntot,np2
 735   data(i+1)=-data(i+1)
 740   np2=np2+np2
 ntot=ntot+ntot
 j=ntot+1
 imax=ntot/2+1
 745   imin=imax-2*nhalf
 i=imin
 go to 755
 750   data(j)=data(i)
 data(j+1)=-data(i+1)
 755   i=i+2
 j=j-2
 if(i-imax)750,760,760
 760   data(j)=data(imin)-data(imin+1)
 data(j+1)=0.
 if(i-j)770,780,780
 765   data(j)=data(i)
 data(j+1)=data(i+1)
 770   i=i-2
 j=j-2
 if(i-imin)775,775,765
 775   data(j)=data(imin)+data(imin+1)
 data(j+1)=0.
 imax=imin
 go to 745
 780   data(1)=data(1)+data(2)
 data(2)=0.
 go to 900
 c
 c
 800   if (i1rng-np1)805,900,900
 805   do 860 i3=1,ntot,np2
 i2max=i3+np2-np1
 do 860 i2=i3,i2max,np1
 imin=i2+i1rng
 imax=i2+np1-2
 jmax=2*i3+np1-imin
 if(i2-i3)820,820,810
 810   jmax=jmax+np2
 820   if(idim-2)850,850,830
 830   j=jmax+npo
 do 840 i=imin,imax,2
 data(i)=data(j)
 data(i+1)=-data(j+1)
 840   j=j-2
 850   j=jmax
 do 860 i=imin,imax,npo
 data(i)=data(j)
 data(i+1)=-data(j+1)
 860   j=j-npo
 c
 c
 900 npo=np1
 np1=np2
 910   nprev=n
 920   return
 end
 
 
 
 
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