%your log says: % % MP prueba-mpgraph.1] (./prueba.tuo) % system(mpost --alias=mpost --undump=metafun prueba-mpgraph)...disabled. % %which means that you should enable write18 in your local texmf.cnf file %(kpsewhich texmf.cnf will tell you where this file resides) % %Hans Hi; Thanks Hans. Unfortunately my system have not a file called texmf.cnf. Is this a MikTeX file or a ConTeXt file? Could I download it from some place? In which directory I must copy the file? Thank you very much. Eduardo F. Cassiraga Departamento de Ingeniería Hidráulica y Medio Ambiente Universidad Politécnica de Valencia C/. Camino de Vera, s/n 46022 Valencia - SPAIN Tel: +34 963 879 613 Fax: +34 963 877 618 E-mail: efc@dihma.upv.es