Re: [Help-glpk] Changes in solution file format?

[Andrew Makhorin]

> I'm wondering whether there is an undocumented change in the solution
> plain text format. 
> 
> Solving a problem with glpsol v. 4.52 with 7 constraints and 12
> variables the first line in the solution file (generated with --write)
> is "8 12". I understand it as 8 lines (objective function + 7
> constraints) and 12 variables. Doing the same thing with glpsol v.
> 4.53 a first line "7 12" (7 constraints and 12 variables) occurs.  
> 
> In the manual is the behavior of glpsol v.4.52 described (page 86) :
> m n 
> m is the number of rows (auxiliary variables);
> n is the number of columns (structural variables);
> 
> 
> Am I right or wrong?
> 

This may happen if your model is in mps format. In 4.53 the mps reading
routine was changed to remove all free rows, so the objective function
row being marked as free is removed.