Question

lingo中if语言怎么用啊？求大神帮忙！

model:
sets:
mydata/1,2,3,4,5,6/:bk,ak,supply,stock;
endsets
@for(mydata(i):
@if(i#eq#1,stock(i)=2+supply(i)-bk(i));
@if(i#gt#2,stock(i)=stock(i-1)+supply(i)-bk(i));
我想令初始库存stock=2；然后下一个库存stock=上一个库存+supply(i)-bk(i)；
怎么写啊？？？？急···
sets:
mydata/1,2,3,4,5,6/:need,time,supply,stock;
endsets
min=@sum(mydata(i):time(i)*supply(i));
@for(mydata(i):
supply(i)>=need(i);
stock(i)<=9);
stock(1)=2+supply(1)-need(1);
@for(mydata(i)|i#gt#1: stock(i)=stock(i-1)+supply(i)-need(i));
stock(6)<=0;
data:
need= 8 5 3 2 7 4;
time=11 18 13 17 20 10;
enddata
end

Answer 1

stock(1)=2+supply(1)-bk(1);

@for(mydata(i)|i#gt#1: stock(i)=stock(i-1)+supply(i)-bk(i));

追问

大哥，谢谢啊，但是我的程序还是运行不出来，能帮帮我吗？

追答

sets:
mydata/1,2,3,4,5,6/:need,time,supply,stock;
endsets
min=@sum(mydata(i):time(i)*supply(i));
@for(mydata(i):
stock(i)=need那个约束根本就不对 去掉就行了 那个是没有可行解 自己好好想想