资源路径位置：类型 CPLEX（默认）无法提取表达式

Question

我遇到错误：

CPLEX(default) cannot extract expression

关于表达式

"minimize (1 / 2)*(sum(i in 923..931, j in 1..18, k in 923..931, l in 1..18) (((f[i]*s[i][k])*d[j][l])*x[i][j])*x[k][l])+(1 / 2)*(sum(i in 1..922, j in 1..18, k in 923..931, l in 1..18) (((f[i]*s[i][k])*d[j][l])*y[i][j])*x[k][l])+(1 / 2)*(sum(i in 923..931, j in 1..18, k in 1..922, l in 1..18) (((f[i]*s[i][k])*d[j][l])*x[i][j])*y[k][l])+sum(i in 923..931, j in 1..18) (f[i]*rs[j])*x"[i][j]."

谁能帮帮我？我已经尝试使用 "using CP;" 但它没有用。

我的代码如下：

 // Indices, Parameters and variables

 int  Nbeitems=...;
 int  Nbnitems=...;
 int  Nbcorridors=...;

 range nitems = Nbeitems+1..Nbeitems+Nbnitems;
 range eitems = 1..Nbeitems;
 range corridors = 1..Nbcorridors;

 dvar boolean x[nitems][corridors];

 float y[eitems][corridors]=...;
 float f[nitems]=...;
 float s[nitems][nitems]=...;
 float d[corridors][corridors]=...;
 float rs[corridors]=...;
 float S[nitems]=...;


 // objective funtion
minimize 1/2*sum(i in nitems,j in corridors, k in nitems,l in corridors) f[i]*s[i][k]*d[j][l]*x[i][j]*x[k][l]+1/2*sum(i in eitems,j in corridors,k in nitems,l in corridors) f[i]*s[i][k]*d[j][l]*y[i][j]*x[k][l]+1/2*sum(i in nitems,j in corridors,k in eitems,l in corridors) f[i]*s[i][k]*d[j][l]*x[i][j]*y[k][l] + sum(i in nitems, j in corridors) f[i]*rs[j]*x[i][j];

// constraints
subject to
{ forall (j in corridors)
    ctEachitemhasoneslot:
        sum (i in eitems) y[i][j] + sum (i in nitems) x[i][j] <= 90;

  forall (i in nitems)
    ctEachitemhasstorenecessities:
        sum(j in corridors) x[i][j]==S[i];

}

Answer 1

类似问题 https://developer.ibm.com/answers/questions/523660/cplexdefault-cannot-extract-expression.html?utm_campaign=answers&utm_medium=email&utm_source=answers-new-question&utm_content=answers-answer-question

在您的 objective 中，您超出了范围。但是如果你写

 minimize 1/2*sum(i in nitems,j in corridors, k in nitems,l in corridors) 
  f[i]*s[i][k]*d[j][l]*x[i][j]*x[k][l]+1/2*
  sum(i in eitems,j in corridors,k in nitems,l in corridors:i in nitems) 
  f[i]*s[i][k]*d[j][l]*y[i][j]*x[k][l]+
  1/2*sum(i in nitems,j in corridors,k in eitems,l in corridors:k in nitems) f[i]*s[i][k]*d[j][l]*x[i][j]*y[k][l] + 
  sum(i in nitems, j in corridors) f[i]*rs[j]*x[i][j];

然后他们就走了

资源路径位置：类型 CPLEX（默认）无法提取表达式

Resource Path Location : Type CPLEX(default) cannot extract expression

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