Jep is a mathematical equation parsing and evaluation library written in java. It features fast evaluation, a configurable architecture allowing custom syntax, support for BigDecimal, complex numbers and vectors It is developed by Singular Systems

GWT-Jep is a port of Jep to run in javascript and has all the features of Jep apart from a small set of changes necessary for javascript compatibility. It is compiled from Java using the Google Web Toolkit. It is available as a seperate package from SingSurf.

Example equations:

Jep plotting apps

graphs
Graphs
y=a x^2+b x+c
parametric
Parametric
x=cos(t), y=sin(t)
polar
Polar
r = cos(3 th/2)
polar
Complex
(z+a)/(z+b)
implicit
Implicit
x^2+y^2=1
implicit
Grids
[x+x^2+x*y-y^2,
y+x^2+x*y]
parameterized surfaces

Parameterized Surface
3D implicit surfaces

3D Implicit