A phylogenetic C interpreter for TNT

Motivation: TNT (a widely used program for phylogenetic analysis) includes an interpreter for a scripting language, but that implementation is nonstandard and uses several conventions of its own. This article describes the implementation and basic usage of a C interpreter (with all the ISO essentials) now included in TNT. A phylogenetic library includes functions that can be used for manipulating trees and data, as well as other phylogeny-specific tasks. This greatly extends the capabilities of TNT.