!&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
      subroutine stomoptimization(npoints,ioption,pco2s0,rehulfsurf0,
     &gammas0,yAnet0,gswmeas0,stomintercept,stomslope,pvapordef_s0,
     &rayDzero)
      implicit none
      include '../testarea/stomoptim.h'
c
      integer npoints,ioption
      double precision pco2s0(npoints),rehulfsurf0(npoints),
     &gammas0(npoints),yAnet0(npoints),gswmeas0(npoints),
     &pvapordef_s0(npoints),stomintercept,stomslope,rayDzero
      integer i,ndim
      double precision beta(10),fatbeta,ftol,f1dim_stom
      parameter(ftol=1.0d-7)
      external funkmin_stom,f1dim_stom

      istommodel=ioption
      nobs = npoints
 
      do i=1,npoints
        pco2s(i)=pco2s0(i)
        rehulfsurf(i)=rehulfsurf0(i)
        gammas(i)=gammas0(i)
        assim_net(i)=yAnet0(i)
        gswmeas(i)=gswmeas0(i)
        pvapordef_s(i)=pvapordef_s0(i)
      enddo
      
      ndim=2
      beta(1)=stomintercept
      bmin(1)=0.0d0
      bmax(1)=1.0d+7
      if(stomintercept.lt.bmin(1).or.stomintercept.gt.bmax(1))
     &beta(1)=0.001d0

      beta(2)=stomslope
      bmin(2)=0.0d0
      bmax(2)=1.0d+8
      if(stomslope.lt.bmin(2).or.stomslope.gt.bmax(2))
     &beta(2)=10.0d0

      if(istommodel.eq.1.or.istommodel.eq.3)then
        ndim=2
      endif
      if(istommodel.eq.2.or.istommodel.eq.4)then
        ndim=3
        beta(3)=rayDzero
        bmin(3)=0.00001d0
        bmax(3)=1.0d+8
        if(rayDzero.lt.bmin(3).or.rayDzero.gt.bmax(3))
     &beta(3)=2000.0d0
      endif
!
! Initialize the cost function evaluation counter in the subroutine funkmin.
! The counter counts and memorizes points where the cost function is evaluated.
      
      call funkmin_stom(ndim,beta,fatbeta)
      call nongradopt(ndim,funkmin_stom,f1dim_stom,beta,
     &      bmin,bmax,ftol,fatbeta)
      call RepeatCompassSearch(ndim,beta,fatbeta,bmin,
     &  bmax,funkmin_stom,f1dim_stom,ftol)
! Replace these parameters with their optimized values
      stomintercept=beta(1)
      stomslope=beta(2)
      if(istommodel.eq.2.or.istommodel.eq.4)rayDzero=beta(3)
      return
      END subroutine stomoptimization
c
!$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$