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Showing content from https://www.gams.com/latest/docs/apis/examples_dotnet/Transport4_8cs_source.html below:

Transport4/Transport4.cs Source File

2using

System.Collections.Generic;

22 static void

Main(

string

[] args)

25 if

(Environment.GetCommandLineArgs().Length > 1)

26

ws =

new GAMSWorkspace

(systemDirectory: Environment.GetCommandLineArgs()[1]);

31

List<string> plants =

new

List<string>()

33 "Seattle"

"San-Diego" 35

List<string> markets =

new

List<string>()

37 "New-York"

"Chicago"

"Topeka" 39

Dictionary<string, double> capacity =

new

Dictionary<string, double>()

41

{

"Seattle"

, 350.0 }, {

"San-Diego"

, 600.0 }

43

Dictionary<string, double> demand =

new

Dictionary<string, double>()

45

{

"New-York"

, 325.0 }, {

"Chicago"

, 300.0 }, {

"Topeka"

, 275.0 }

47

Dictionary<Tuple<string,string>,

double

> distance =

new

Dictionary<Tuple<string,string>,

double

>()

49

{

new

Tuple<string,string> (

"Seattle"

"New-York"

), 2.5 },

50

{

new

Tuple<string,string> (

"Seattle"

"Chicago"

), 1.7 },

51

{

new

Tuple<string,string> (

"Seattle"

"Topeka"

), 1.8 },

52

{

new

Tuple<string,string> (

"San-Diego"

"New-York"

), 2.5 },

53

{

new

Tuple<string,string> (

"San-Diego"

"Chicago"

), 1.8 },

54

{

new

Tuple<string,string> (

"San-Diego"

"Topeka"

), 1.4 }

61 foreach

(

string

in

plants)

64 GAMSSet

j = db.AddSet(

"j"

, 1,

"markets"

);

65 foreach

(

string

in

markets)

68 GAMSParameter

a = db.AddParameter(

"a"

"capacity of plant i in cases"

, i);

69 foreach

(

string

in

plants)

72 GAMSParameter

b = db.AddParameter(

"b"

"demand at market j in cases"

, j);

73 foreach

(

string

in

markets)

76 GAMSParameter

d = db.AddParameter(

"d"

"distance in thousands of miles"

, i, j);

77 foreach

(Tuple<string,string> t

in

distance.Keys)

80 GAMSParameter

f = db.AddParameter(

"f"

"freight in dollars per case per thousand miles"

);

84 GAMSJob

t4 = ws.AddJobFromString(GetModelText());

87

opt.

Defines

.Add(

"gdxincname"

, db.Name);

88

opt.AllModelTypes =

"xpress"

;

91

Console.WriteLine(

"x("

+ rec.Key(0) +

","

+ rec.Key(1) +

"): level="

+ rec.

Level

" marginal="

+ rec.

Marginal

);

95 static

String GetModelText()

103 a(i) capacity of plant i in cases 104 b(j) demand at market j in cases 105 d(i,j) distance in thousands of miles 106 Scalar f freight in dollars per case per thousand miles; 108$if not set gdxincname $abort 'no include file name for data file provided' 113 Parameter c(i,j) transport cost in thousands of dollars per case ; 115 c(i,j) = f * d(i,j) / 1000 ; 118 x(i,j) shipment quantities in cases 119 z total transportation costs in thousands of dollars ; 121 Positive Variable x ; 124 cost define objective function 125 supply(i) observe supply limit at plant i 126 demand(j) satisfy demand at market j ; 128 cost .. z =e= sum((i,j), c(i,j)*x(i,j)) ; 130 supply(i) .. sum(j, x(i,j)) =l= a(i) ; 132 demand(j) .. sum(i, x(i,j)) =g= b(j) ; 134 Model transport /all/ ; 136 Solve transport using lp minimizing z ;

GAMSVariable GetVariable(string variableIdentifier)

GAMSSet AddSet(string identifier, int dimension, string explanatoryText="", SetType setType=SetType.multi)

void Run(GAMSOptions gamsOptions=null, GAMSCheckpoint checkpoint=null, TextWriter output=null, Boolean createOutDB=true)

Dictionary< string, string > Defines

new GAMSParameterRecord AddRecord(params string[] keys)

new GAMSSetRecord AddRecord(params string[] keys)

GAMSDatabase AddDatabase(string databaseName=null, string inModelName=null)

This is the 4th model in a series of tutorial examples. Here we show: How to define data using C# dat...

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