[Help-glpk] Change Parameter

[Marcos Roberto Silva]

Dear Friends,
I create a simple C code to solve the model *.mod with the data file, 
with the API's, but I need to run program several times changing one 
single parameter of the data file.
It's possible to change this parameter (into the C code) without create 
a new data file? There are some function to do this?

Thank You.

Marcos Roberto Silva

Example: I want to change only the lambda parameter at each run.

data;

param n := 5;
param lambda := 0.5;

param c1 :  1  2  3  4  5 :=
     1   13 14 7 2 11
     2   5 10 11 7 10
     3   7 19 9 16 19
     4   3 19 10 0 6
     5   12 9 2 4 15 ;

param c2 :  1  2  3  4  5 :=
     1   1 13 15 18 3
     2   0 3 17 8 6
     3   9 5 8 0 4
     4   18 19 3 19 7
     5   2 3 19 12 15 ;
end;