GPEM 18(4) is available

The fourth issue of Volume 18 of Genetic Programming and Evolvable Machines is now available for download. It contains:

A meta-grammatical evolutionary process for portfolio selection and trading
by Iván Contreras, J. Ignacio Hidalgo, Laura Nuñez-Letamendía & J. Manuel Velasco

Affective evolutionary music composition with MetaCompose
by Marco Scirea, Julian Togelius, Peter Eklund & Sebastian Risi

Understanding grammatical evolution: initialisation
by Miguel Nicolau

BOOK REVIEW
Gustavo Olague: Evolutionary computer vision, the first footprints
by Evelyne Lutton