Equation Calculator for Android

The Equation_Calculator application is used to numerically find approximations to the roots of a polynomial up to 5 degree. The implementation applies the Newton method and as second Durand-Kerner-Weierstrass method to determine approximations to the roots of a polynomial with real coefficients. The application stores and processes the data of one polynomial. into a database, as opposed to Advance_Equation__Calculator application designed to store and process the data of many polynomials.

Polynomial coefficients can be set as Java Script arithmetic expressions.

The app stores the data in a database of type SQLit. The application has localization in Bulgarian and English

The app has function “Export data for print” writes data from a list of full numerical approximations and rounded approximations of the roots in a EquationRoots.txt file and display a dialog for choosing a storage option locally in Phonstorage on the device where the application is appended or sent to various Internet options( Skype, Viber, e-mail).

The app has function to show the meaning of the polynomial in points and showing graph of roots i complex plan

Individual coefficients of equation can be represent AS Java Script arithmetic expressions of constants. For calculating them, the "Eval JS" button is pressed repeatedly (one click for each arithmetic expression, i.e. for all 6 coefficients 6 times the button is pressed,followed by another scan of expressions ). After calculating the arithmetic expression, its value is visualized at its place as a coefficient of equation. The permissible arithmetic operators are: plus (+), minus (-), multiplication (*), dсvision (/), Math .. Here is an example of a valid arithmetic expression: (7.8934 + 0.99876) * Math.PI which has a value of 27.9354 .