关于GAMS的问题，小弟询问咯？？请大侠释义…………
非常感谢亲！！请各位一定帮帮忙！！学期作业啊！！！我把程序贴在这，
$Title A Investment Problem
$ontext
this problem finds a optimized investment that meets
requirements in the city
$offtext
Sets
i power plants /plant-1, plant-2, plant-3, plant-4/
j operating mode /mode-1, mode-2, mode-3/;
Parameters
c(i) the unit installed capacity of power plant i in cases
/plant-1 10
plant-2 7
plant-3 16
plant-4 6/
d(j) the electricity demand for power plant i in cases
/mode-1 3
mode-2 3
mode-3 2/;
Table f(i,j) the unit operating cost of each power plant
mode-1 mode-2 mode-3
plant-1 0.4 0.24 0.04
plant-2 0.45 0.27 0.045
plant-3 0.32 0.192 0.032
plant-4 0.55 0.33 0.055;
Scalar m the minimum total installed capacity of the four power plant /12/
b the minimum tatal investment budget of the four power plant /120/;
Variables
x(i) the installed capacity of the i power plant in cases
y(i,j) the operating lever of the i power plant under the j operating mode
z the total cost of the four power plant;
Positive Variable x;
Equations
cost define objective function
capacity1(i) observe total capacity linmit at plant i
budget(i) observe total investment budget limit at plant i
capacity2(i) observe installed capacity for each power plant
demand(i) satisfy the electricity demand under each operating mode;
cost.. z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
capacity1(i).. sum(i,x(i)) =g= m;
budget(i).. sum(i,c(i)*x(i)) =l= b;
capacity2(j).. sum(j,y(i,j)) =l= x(i);
demand(i).. sum(i,y(i,j)) =g= d(j);
Model investment /all/;
Solve investment using lp minimizing z;
Display y.l, y.m;
运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！
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