SUBROUTINE fdjac(n,x,fvec,np,df)
      INTEGER n,np,NMAX
      REAL df(np,np),fvec(n),x(n),EPS
      PARAMETER (NMAX=40,EPS=1.e-4)
CU    USES funcv
      INTEGER i,j
      REAL h,temp,f(NMAX)
      do 12 j=1,n
        temp=x(j)
        h=EPS*abs(temp)
        if(h.eq.0.)h=EPS
        x(j)=temp+h
        h=x(j)-temp
        call funcv(n,x,f)
        x(j)=temp
        do 11 i=1,n
          df(i,j)=(f(i)-fvec(i))/h
11      continue
12    continue
      return
      END
C  (C) Copr. 1986-92 Numerical Recipes Software .