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！！！
! O/ J) o; H$ |& b我把程序贴在这，
' S9 k; P9 D% {7 u3 x- _$Title A Investment Problem
$ontext
this problem finds a optimized investment that meets
requirements in the city
$ L' a4 L% B/ s% M( Y& P! D8 Y$offtext
! P8 R9 [& @! ?, b/ @- l6 bSets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
1 a# N: z3 m9 s! b) \# z* h    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
; C& r5 [8 t, u8 Z    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
        plant-2  7
- d; C  z$ K0 j2 e" @        plant-3  16
8 W# [0 E/ M4 |8 {. ~7 b4 I3 A        plant-4  6/
% ?4 h% M! h# D1 w    d(j)  the electricity demand for power plant i in cases
1 E7 |" H+ a0 D- s+ M( D       /mode-1  3
        mode-2  3
        mode-3  2/;
0 [* U- n& i- M& |3 {( C$ dTable f(i,j) the unit operating cost of each power plant
                 mode-1   mode-2   mode-3
8 d8 g5 O7 J# `7 i        plant-1   0.4      0.24     0.04
( ]* V3 D( Y2 g/ ~        plant-2   0.45     0.27     0.045
        plant-3   0.32     0.192    0.032
7 F# V! r3 K' b6 M/ e        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/;
) h. s) R4 j+ pVariables
       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
2 |$ D% z/ R+ k. v       z the total cost of the four power plant;
Positive Variable x;
5 S5 x( ^6 J3 DEquations
' q8 c" l' \5 E5 ?% Y       cost           define objective function
       capacity1(i)   observe total capacity linmit at plant i
$ g1 ?1 E/ u% R/ i0 k, J* B$ g       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;
: N' f8 L2 m: F) l+ N7 ncost..            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);
0 z/ Q7 U- W3 i* b' k' E+ _demand(i)..       sum(i,y(i,j)) =g= d(j);
  I3 D" w3 U# wModel investment /all/;
Solve investment using lp minimizing z;
Display y.l, y.m;
! N. v- X& |% b
运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！