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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:
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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