线性规划

• lingo代码如下

	model:	
	sets:
	products/desks,tables,chairs/:interest,volume;
	materials/1..3/:capacity;
	links(products,materials):x;
	endsets
	data:
	interest=60,30,20;
	capacity=48,20,8;
	x=8,4,2
	6,2,1.5
	1,1.5,0.5;
	enddata
	max=@sum(products(i):interest(i)*volume(i));
	@for(materials(j):@sum(products(i):x(i,j)*volume(i))<=capacity(j));
	volume(2)<=5;
	end

• 函数由model开始，end结束
• set与endsets之间定义集合
• data与enddata之间输入数据
• @sum函数冒号前为求和的下标，冒号后为求和内容
• @for函数用来对集合的成员生成约束表达式，冒号前为集合名称，冒号后为约束表达式