[Help-glpk] MathProg

[address@hidden]

Hello
I have a couple of questions about MathProg: 
 
Is it possible to have a constraint generated 
conditional on the value of a parameter? I am 
aware of the conditional expression, but this 
doesn't seem to do quite what I want, which is 
to have a whole statement processed 
conditionally. I want to do something like: 
 
param p; 
set S := 0..9; 
var x{s in S}; 
param y{s in S}; 
var z; 
if p = 1 
        my_constraint{s in S}: x[s] + z <= y[s]; 
 
 
Secondly, is it possible to include another file 
in a model? I ask this because I need to create 
several similar models with only a few different 
constraints, and it would be easier to maintain 
if all the common code was in one file included 
by the others. Something similar to #include in 
C/C++ would be ideal, but I can find no mention 
of anything like this in the documentation. 
 
 
        Andrew