The RapidEvaluator Delphi component is a real COMPILERof the mathematical expressions (formulas), such as 'SIN(0.5)+COS(x)*2'. It checks the expression syntax and generates the real machine code for evaluating given formula. The code generated is optimized to use FPU in order to achieve the maximal speed of calculations: it's even up to 2 times faster than Delphi's 32-bit code. To satisfy your personal needs you can add external user-defined variables and functions in addition to built-in ones. Use RapidEvaluator to calculate formulas that is unknownat the stage of program compilation, for example toplot and tabulate functions, to make numerical computations and so on. The equation plotting demo program (project+EXE) included.