R中的optimx优化

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     大家能帮我解读一下这段代码么，在R中怎样实现这个优化。毕业论文要用这提到的方程和优化方法，但是却不知道怎样进行这个过程。模型是这样的

Appendix. Optimization procedure###(附件.优化过程)
# 1: main function (which is optimizedlater) ##（主函数（稍后优化））
function sub_optimization(input parameters:αi for each species i)（子优化函数（为每物种输入参数αi））
total_criterion_sum = 0
for each stand p{
  #definition of linear programming variables
Amatrix = matrix(ncol=number of species,nrow= number of
inventories in this plot)
  #vector corresponding to the sums of Amatrixcolumn
Initializing cvector #vectorsize: number of species
  #vector of constraints: all are equal to 1
bvector= [1,1 … 1] #vector size: number ofinventories
for each species i{
   for each date t{
   }
   }

  #linear programming (through the R package “solveLP”)

LPresult = linear programming (inputparameters: Amatrix, bvector, cvector)

# computation ofthe criterion (as presentedin Equation 9) for this stand

# the criterion for all stands
total_criterion_sum = total_criterion_sum +criterion_stand
}
return(total_criterion_sum)
} #end of sub_optimization function
#2 : all.LPresult is optimized by amaximum-likelihood estimation. Outputs are αi
for each species i, constrained between 0and 3.
optim( sub_optimization, start = { αi=1.8} , lower=0, upper=3 )

#end of script

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关键词：Optim OPT Tim Optimization Programming definition procedure function 毕业论文 number

稍微解释一下呗～