关于GAMS的问题，小弟询问咯？？请大侠释义…………

随墨枫飞

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，
8 R  A, G/ C0 z$Title A Investment Problem
$ontext
) Z3 @: B/ V' ?. `this problem finds a optimized investment that meets
requirements in the city
- d- |/ C4 V0 |0 q4 y$offtext
Sets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
+ Q# \5 }% o& M2 u4 \* jParameters
    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
5 S3 A: d8 N6 A. }+ I( @        plant-2  7
        plant-3  16
8 a, P0 {" U% o        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
        mode-2  3
* f% ]7 I2 h% U+ n* L" n9 W        mode-3  2/;
Table f(i,j) the unit operating cost of each power plant
7 `9 z; }- N5 A                 mode-1   mode-2   mode-3
7 K; k$ s0 z* d; @5 ]        plant-1   0.4      0.24     0.04
% x- m: Z  a* V% O6 M! w/ _, U        plant-2   0.45     0.27     0.045
4 U" f  A7 @2 I        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
! J1 u5 l9 u, n+ o# |' BScalar 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;
! {' R6 f1 W$ o. m- R5 z' d0 sEquations
. x4 T1 ~4 Y, N: |       cost           define objective function
+ |1 }$ `! {" N$ I* o$ `2 \       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
- _+ c+ R, A: }; V1 j. O# r  r       demand(i)      satisfy the electricity demand under each operating mode;
  |1 M5 T& o7 ^  Gcost..            z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
" O3 m& J! v# f! {1 A9 N( Zcapacity1(i)..    sum(i,x(i)) =g= m;
budget(i)..       sum(i,c(i)*x(i)) =l= b;
- t- a, b, ~- ?7 acapacity2(j)..    sum(j,y(i,j)) =l= x(i);
+ Y* Z. l0 g1 W+ y+ _demand(i)..       sum(i,y(i,j)) =g= d(j);
Model investment /all/;
) w3 a& e3 f# Z+ Y$ W* q- dSolve investment using lp minimizing z;
Display y.l, y.m;
; [( y" @9 j6 a1 q: E
% s- r2 ?& e& A) B3 p运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！