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transport4.py File Reference

This is the 4th model in a series of examples. More...

Go to the source code of this file.


str transport4.GAMS_MODEL
sys transport4.sys_dir = sys.argv[1] if len(sys.argv) > 1 else None
GamsWorkspace transport4.ws = GamsWorkspace(system_directory=sys_dir)
list transport4.plants = ["Seattle", "San-Diego"]
list transport4.markets = ["New-York", "Chicago", "Topeka"]
dict transport4.capacity = {"Seattle": 350.0, "San-Diego": 600.0}
dict transport4.demand = {"New-York": 325.0, "Chicago": 300.0, "Topeka": 275.0}
dict transport4.distance
GamsWorkspace transport4.db = ws.add_database()
GamsWorkspace transport4.i = db.add_set("i", 1, "canning plants")
GamsWorkspace transport4.j = db.add_set("j", 1, "markets")
GamsWorkspace transport4.a = db.add_parameter_dc("a", [i], "capacity of plant i in cases")
GamsWorkspace transport4.b = db.add_parameter_dc("b", [j], "demand at market j in cases")
GamsWorkspace transport4.d = db.add_parameter_dc("d", [i, j], "distance in thousands of miles")
GamsWorkspace transport4.f = db.add_parameter("f", 0, "freight in dollars per case per thousand miles")
GamsWorkspace transport4.job = ws.add_job_from_string(GAMS_MODEL)
GamsWorkspace transport4.opt = ws.add_options()

Detailed Description

This is the 4th model in a series of examples.

Here we show:

  • How to define data using Python data structures
  • How to prepare a GamsDatabase from Python data structures

Definition in file transport4.py.