Re: [Help-glpk] Initializing a few decision variables

[Xypron]

Hello Marc,

if B1 is a set, you probably want to write:

s.t. {b in B1} c1 : x[b,21] = 1;
# or
s.t. c2 : x["b",21] = 1; # where "b" is a member of B1

Best regards

Xypron


On 29.07.2011 16:45, Marc Goetschalckx wrote:
> I am using a model coded in GMPL.
> The model has a large two-dimensional array of x variables, one 
> dimension has literal indices that are defined in a set in the data 
> segment (example is B1)
> This model is running and solving so far.
> However, I need to initialize a very few of the x variables because of 
> boundary conditions.
> Statement in the model section is similar to
> s.t. x[B1,21]=1;
> This cannot be done because B1 is not yet defined (from the data 
> section).
> How can I initialize some of the variables in the data section, or 
> what is the sequence of actions that can achieve this.
> Thanks.