# Features

Here are the main features of Euler.

- Real, complex and interval scalars and matrices,
- a programming language, with local variables, default values for parameters, variable parameter number, function parameters,
- two and three dimensional graphs,
- marker plots,
- density and contour plots,
- animations and stereographic plots,
- numerical integration (Romberg, Simpson, Gauß) and differentiation,
- statistical functions and tests,
- differential equations,
- interval methods with guaranteed inclusions,
- function minimizers (Brent, Nelder-Mean),
- simplex algorithm,
- interpolation and approximation,
- finding roots of polynomials,
- calling of functions in external DLLs,
- sound playing,
- fast Fourier transform (FFT),
- exact scalar products using a long accumulator,
- Postscript graphics export (thanks to Eric Boucharé)
- editable command window with comments,
- normal, user friendly GUI,
- graphics export in various formats (WMF over the clipboard),
- internal and external editor,
- symbolic computation using Yacas.

and lots more.