Sets
i canning plants / Seattle, San-Diego /
j markets / New-York, Chicago, Topeka / ;
Parameters
a(i) capacity of plant i in cases
/ Seattle350
San-Diego 600 /
b(j) demand at market j in cases
/ New-York 325
Chicago 300
Topeka 275 / ;
Table d(i,j) distance in thousands of miles
New-York Chicago Topeka
Seattle 2.5 1.7 1.8
San-Diego 2.5 1.8 1.4 ;
Scalar f freight in dollars per case perthousand miles /90/ ;
Parameter c(i,j) transport cost in 1000s ofdollars per case ;
c(i,j) = f*d(i,j)/1000 ;
Variables
x(i,j) shipment quantities in cases
z total transportation costs in 1000s ofdollars ;
Positive variable x ;
Equations
cost define objective function
supply(i) observe supply limit at plant i
demand(j) satisfy demand at market j ;
cost.. z =e= sum((i,j), c(i,j)*x(i,j)) ;
supply(i) .. sum(j, x(i,j)) =l= a(i) ;
demand(j) .. sum(i, x(i,j)) =g= b(j) ;
Model transport /all/ ;
solve transport using lp minimizing z ;
display x.l, x.m ;
我们老师让我暑假自学GAMS 这是他给我的教程里的语句，但是运行总是显示错误。求大神帮忙看一下问题出在哪里
i canning plants / Seattle, San-Diego /
j markets / New-York, Chicago, Topeka / ;
Parameters
a(i) capacity of plant i in cases
/ Seattle350
San-Diego 600 /
b(j) demand at market j in cases
/ New-York 325
Chicago 300
Topeka 275 / ;
Table d(i,j) distance in thousands of miles
New-York Chicago Topeka
Seattle 2.5 1.7 1.8
San-Diego 2.5 1.8 1.4 ;
Scalar f freight in dollars per case perthousand miles /90/ ;
Parameter c(i,j) transport cost in 1000s ofdollars per case ;
c(i,j) = f*d(i,j)/1000 ;
Variables
x(i,j) shipment quantities in cases
z total transportation costs in 1000s ofdollars ;
Positive variable x ;
Equations
cost define objective function
supply(i) observe supply limit at plant i
demand(j) satisfy demand at market j ;
cost.. z =e= sum((i,j), c(i,j)*x(i,j)) ;
supply(i) .. sum(j, x(i,j)) =l= a(i) ;
demand(j) .. sum(i, x(i,j)) =g= b(j) ;
Model transport /all/ ;
solve transport using lp minimizing z ;
display x.l, x.m ;
我们老师让我暑假自学GAMS 这是他给我的教程里的语句，但是运行总是显示错误。求大神帮忙看一下问题出在哪里
