Re: [Help-glpk] Passing command line paramters to GLPK

[Andrew Makhorin]

> data bases will often contain multiple problem instances. Currently
> to select a problem instance it is necessary to edit the model or the
> data file passed to GLPSOL. It would be useful if the problem instance
> could be passed on the command line.

> My implementation idea is to add an option -v to be used as follows:

> ./glpsol -m model.mod -v var1=val1 -v var2=val2 ...

> Internally this should create a set
> set _ARGV := var1 var2;
> and a parameter
> param _ARGP := 
>   [var1] val1
>   [var2] val2;

> A usage example is:

> table ti IN
>   'MySQL'
>   'Database=glpk;UID=glpk;PWD=gnu'
>   'SELECT COL, LIN, VAL FROM sudoku WHERE ID = ' & _ARGP['ID'] :
>   FIELDS <- [COL, LIN], givens ~ VAL;

All necessary substitutions can be made with the C preprocessor.
For example:

   gcc -E -Dfoo1=bar1 -Dfoo2=bar2 model.txt > model.mod
   glpsol -m model.mod

Another way is to use, say, sed. One could even write a shell script
to make that more convenient.