Gdxin

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This dollar command is used in a sequence to load specified items from a GDX file.  It is employed using the syntax

 

$Gdxin filename

 

where filename gives the name of the GDX file (with or without the extension GDX) and the command opens the specified GDX file for reading

and

$Gdxin

 

where the command closes the specified GDX file.

The command must be used in conjunction with the command $Load.

Example:

(gdxintrnsport.gms)

$gdxin tran2

$Load

  Sets

       i   canning plants

       j   markets          ;

$Load i j

  Parameters

       a(i)  capacity of plant i in cases

       b(j)  demand at market j in cases;

$Load a=sup

$Load b=dem

  Parameter d(i,j)  distance in thousands of miles;

$Load d

  Scalar f  freight in dollars per case per thousand miles   ;

$Load f

$gdxin

Notes:

•A Gdxin command followed by the name of the GDX file to use must precede all $Load commands and opens the file.
•A Gdxin command without following arguments must succeed the Load command or commands and closes the file.  More than one Load can appear in between.