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，
$Title A Investment Problem
$ontext
. ^, m9 Q. n5 W( W; \! Othis problem finds a optimized investment that meets
6 z+ w' B- S) f2 L# X" arequirements in the city
- _% I5 g# `$ E# h2 O$ g$offtext
, g& J( f1 E7 @+ v8 G$ b: ZSets
6 t+ E9 j" E* i9 \& V    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
' W% h4 {' q: M5 ~& @& H    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
" N1 E4 ~# N" f/ C+ E        plant-2  7
: C! U, J0 O  f* X; T; v) O, F        plant-3  16
6 C& p( @4 P! k) R        plant-4  6/
# H1 ~: K: Z4 C    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
- M6 t! u& g9 P9 _; ^  m                 mode-1   mode-2   mode-3
0 U  Y( v7 [, W4 ~        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;
: N( R4 ]) R5 Z6 [7 wScalar m the minimum total installed capacity of the four power plant /12/
( C" o5 W6 F9 x       b the minimum tatal investment budget of the four power plant /120/;
6 l7 {& \& O2 b" ~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;
/ l! u' O2 N+ V: G6 m+ X4 BPositive Variable x;
Equations
7 r% h) J% ^( i: r, I  ~       cost           define objective function
       capacity1(i)   observe total capacity linmit at plant i
% N$ A, x2 G6 F$ t5 z0 J       budget(i)      observe total investment budget limit at plant i
3 b3 |/ J6 C: d8 S       capacity2(i)   observe installed capacity for each power plant
       demand(i)      satisfy the electricity demand under each operating mode;
4 x$ p% O& B" z. [( Z  Tcost..            z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
( r! `* z/ a. Tcapacity1(i)..    sum(i,x(i)) =g= m;
budget(i)..       sum(i,c(i)*x(i)) =l= b;
/ H! l/ w) s" Jcapacity2(j)..    sum(j,y(i,j)) =l= x(i);
% i. X- ]( }' E; I- C" vdemand(i)..       sum(i,y(i,j)) =g= d(j);
* {" }* Y. @' u6 PModel investment /all/;
+ e7 t3 ~6 f4 u  u: T; b% CSolve investment using lp minimizing z;
Display y.l, y.m;

- F/ V% u# H1 E运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！