Cadabra
Computer algebra system for field theory problems

Functionality to evaluate mathematical expressions numerically.
Cadabra's symbolic expressions can be evaluated numerically, e.g. when you want to plot a function. Cadabra contains its own fast numerical evaluator and its own numerical tensor types.
Classes  
class  cadabra::NEvaluator 
Functionality to numerically evaluate a scalar expression, give the values of its building blocks. More...  