Calculator and function chart

This application has many different functionalities:1. Four different type of calculators for simple calculations, for scientific calculations, for programmers and for statistics2. Functions plotting. With this app, you can plot many different functions in the same chart.3. Surfaces plotting. With this app, you can plot inequalities.4. Iterations plotting. With this app, you can plot iterations.5. Fields plotting. With this app, you can plot scalar fields and vector fields.
More functionalities are about to be programmed in the future updates.