github.com/gspera/meval

Math Evaluator

Math Eval is Yet Another Math Evaluator. for using eval is necessary to create an Evaluator with e := meval.New(). An evaluator contains the variables and the functions e.SetVar("x", 42). For evaluating expressions use the Eval method e.Eval("x+2").

Functions

eval comes with some builtins functions, others may be added in future: Ln, Log10, Log2, Sin, Cos, Tan, Sqrt. e.Eval("ln(2)")

Math Constants

eval comes with some predefine math constants, others may be added in future: Pi, E. e.Eval("pi")

Parser

Meval is currently built around a modified copy the Golang parser, this was chosen for the semplicity of implementing, in future a custom one could be used. The source code of the parser can be found in the internal subdirctory.