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--- home_test_julia [2017/02/07 10:15]
antonello
+++ home_test_julia [2018/06/18 15:11]
@@ Line 1: / Line 1: @@
-===== Installation =====
-**Step 1:**
-  * Option a: Get an account on [[https://juliabox.com|JuliaBox.com]] to run julia/JuMP script without installing anything on the local computer
-  * Option b: Install Julia for your platform ([[http://julialang.org/downloads/|http://julialang.org/downloads/]])
-**Step 2:**
-Run, only once, the following code to install JuMP language and a couple of open source solvers:
-<code julia>
-Pkg.update()                        # To refresh the list of newest packages
-Pkg.add("JuMP")                     # The mathematical optimisation library
-Pkg.add("GLPKMathProgInterface")    # A lineaqr and MIP solver
-Pkg.add("Ipopt")                    # A non-linear solver
-Pkg.add("DataFrames")               # A library to deal with dataframes (R-like tabular data)
-</code>
-===== Model components =====
-==== Importing the libraries ====
-You will need to import as a minima the ''JuMP'' module. If you wish to specify a solver engine rather than letting JuMP select a suitable one, you will need to import also the module relative to the solver, e.g. ''Ipopt'' or  ''GLPKMathProgInterface''
-<code julia>
-# Import of the JuMP and DataFrames modules (the latter one just to import the data from a header-based table, as in the original trasnport example in GAMS
-using JuMP, DataFrames
-</code>
-==== Defining the "sets" ====
-JuMP doesn't really have a concept of sets, but it uses the native containers available in the core Julia language\\Variables, parameters and constraints can be indexed using these containers.\\
-While many works with position-based lists, I find more readable using dictionaries instead. So the "sets" are represented as lists, but then everything else is a dictionary with the elements of the list as keys.\\
-One note: it seems that Julia/JuMP don't like much the "-" symbol, so I replaced it to "_".\\
-<code julia>
-## Define sets ##
-#  Sets
-#       i   canning plants   / seattle, san-diego /
-#       j   markets          / new-york, chicago, topeka / ;
-plants  = ["seattle","san_diego"]          # canning plants
-markets = ["new_york","chicago","topeka"]  # markets
-</code>