Dear Alejandro,
1 - Call glpsol to generate a solution of the LP problem and save it using "-w file.sol"
2 - The file.sol file must have a solution line (first) named "s" "bas", ie a basic solution
3 - Call glpsol by disabling LP (--nopresol) and MILP preprocessing (--nointopt) and include the base file (--ini file.sol)
$ glpsol -m localiz.mod -d localiz.dat --nopresol --nomip -w file.sol
$ glpsol -m localiz.mod -d localiz.dat --nopresol --nointopt --cuts --ini file.sol
Andrew, for MIP problems I had the same problem: a file.sol with "mip" solution, but Glpk display an error message:
"error: wrong solution designator; 'bas' expected"
Bests,
--
João Flávio de Freitas Almeida
Professor Adjunto
Departamento de Engenharia de Produção
Universidade Federal de Minas Gerais
30.310-290 Belo Horizonte MG Brasil