Initial Commit

lib/fcal.f90

@@ -0,0 +1,117 @@
+program fcal
+
+! Compute Intercept (A) and Slope (B) for a series of FreqCal measurements. 
+  parameter(NZ=1000)
+  implicit real*8 (a-h,o-z)
+  real*8 fd(NZ),deltaf(NZ),r(NZ)
+  character infile*50
+  character line*80
+  character cutc*8
+
+  nargs=iargc()
+  if(nargs.ne.1) then
+     print*,'Usage:   fcal <infile>'
+     print*,'Example: fcal fmtave.out'
+     go to 999
+  endif
+  call getarg(1,infile)
+
+  open(10,file=infile,status='old',err=997)
+  open(12,file='fcal.out',status='unknown')
+  open(13,file='fcal.plt',status='unknown')
+
+  i=0
+  do j=1,9999
+     read(10,1000,end=10) line
+1000 format(a80)
+     i0=index(line,' 0 ')
+     i1=index(line,' 1 ')
+     if(i0.le.0 .and. i1.le.0) then
+        read(line,*,err=5) f,df
+        ncal=1
+        i=i+1
+        fd(i)=f
+        deltaf(i)=df
+     else if(i1.gt.0) then
+        i=i+1
+        read(line,*,err=5) f,df,ncal,nn,rr,cutc
+        fd(i)=f
+        deltaf(i)=df
+        r(i)=0.d0
+     endif
+5    continue
+  enddo
+
+10 iz=i
+  if(iz.lt.2) go to 998
+  call fit(fd,deltaf,r,iz,a,b,sigmaa,sigmab,rms)
+
+  write(*,1002) 
+1002 format('    Freq      DF     Meas Freq     Resid'/        &
+            '   (MHz)     (Hz)      (MHz)        (Hz)'/        &
+            '-----------------------------------------')       
+  do i=1,iz
+     fm=fd(i) + 1.d-6*deltaf(i)
+     calfac=1.d0 + 1.d-6*deltaf(i)/fd(i)
+     write(*,1010) fd(i),deltaf(i),fm,r(i)
+     write(13,1010) fd(i),deltaf(i),fm,r(i)
+1010 format(f8.3,f9.3,f14.9,f9.3,2x,a6)
+  enddo
+  calfac=1.d0 + 1.d-6*b
+  err=1.d-6*sigmab
+
+  if(iz.ge.3) then
+     write(*,1100) a,b,rms
+1100 format(/'A:',f8.2,' Hz    B:',f9.4,' ppm    StdDev:',f7.3,' Hz')
+  if(iz.gt.2) write(*,1110) sigmaa,sigmab
+1110 format('err:',f6.2,9x,f9.4,23x,f13.9)
+  else
+     write(*,1120) a,b
+1120 format(/'A:',f8.2,' Hz    B:',f9.4)
+  endif
+
+  write(12,1130) a,b
+1130 format(f10.4)
+
+  go to 999
+
+997 print*,'Cannot open input file: ',infile
+  go to 999
+998 print*,'Input file must contain at least 2 valid measurement pairs'
+
+999 end program fcal
+
+subroutine fit(x,y,r,iz,a,b,sigmaa,sigmab,rms)
+  implicit real*8 (a-h,o-z)
+  real*8 x(iz),y(iz),r(iz)
+
+  sx=0.d0
+  sy=0.d0
+  sxy=0.d0
+  sx2=0.d0
+  do i=1,iz
+     sx=sx + x(i)
+     sy=sy + y(i)
+     sxy=sxy + x(i)*y(i)
+     sx2=sx2 + x(i)*x(i)
+  enddo
+  delta=iz*sx2 - sx*sx
+  a=(sx2*sy - sx*sxy)/delta
+  b=(iz*sxy - sx*sy)/delta
+
+  sq=0.d0
+  do i=1,iz
+     r(i)=y(i) - (a + b*x(i))
+     sq=sq + r(i)**2
+  enddo
+  rms=0.
+  sigmaa=0.
+  sigmab=0.
+  if(iz.ge.3) then
+     rms=sqrt(sq/(iz-2))
+     sigmaa=sqrt(rms*rms*sx2/delta)
+     sigmab=sqrt(iz*rms*rms/delta)
+  endif
+
+  return
+end subroutine fit