Hi Guys,

I wrote a simple code in GAMS, but it also a “Overlapping row name”

error. I tried several times but this error is always there. I am so

confused about this error, because I do not see any Overlapping row

name in my code.

And I really need your help to help me figure out what is wrong in my

code.

Thank you so much!! I am super appreciated!!

The code is as below

Sets

i chains / WDW, DLR/

j departments / Collectibles, Commodities/;

Table A(i,j) Hub Freight

Collectibles Commodities

WDW 521.3249405 18.69082733

DLR 143.1646601 21.56501533;

Variables

o(i,j) percentage go through Hub

p(i,j) percentage store in Hub

q(i,j) percentage go through CC

r(i,j) percentage store in CC

x months store in Hub

y months store in CC

z Total Cost;

Equations

Cost Define objective functions

FillRate1(i,j) fill rate for HUB

FillRate2(i,j) fill rate for CC

StorageMonths1 Total storage months in Supply Chain 1

StorageMonths2 Total storage months in Supply Chain 2;

Cost…z =e= sum((i,j), o(i,j)*A(i,j));

FillRate1(i,j)…o(i,j)*p(i,j)=g=0.25;

FillRate2(i,j)…q(i,j)*r(i,j)=g=0.25;

StorageMonths1…x+y=l=2.8;

StorageMonths2…x+y=g=2.0;

o.lo(i,j) = 0 ;

o.up(i,j) = 1 ;

p.lo(i,j) = 0 ;

p.up(i,j) = 1 ;

q.lo(i,j) = 0 ;

q.up(i,j) = 1 ;

r.lo(i,j) = 0 ;

r.up(i,j) = 1 ;

x.lo=0;

y.lo=0;

Model transport /all/ ;

solve transport using nlp minimizing z ;

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