Introduction - If you have any usage issues, please Google them yourself
The interpreter(name:Tiny Compiler) (now is the fifth edition) is written in c++ , whose grammar rule is similar to C and matlab, It support array and function calls, with a simple interface made from mfc.And there are detailed description and sample programs with it.
new features of the fifth edition: "tridimensional" display of formulas added to the Calculator tool.
new features of the fourth edition: an visual display of the syntax tree added.
Official Blog: http://wantnon.spaces.live.com/blog/cns!22376C1C5B93C0AD!464.entry