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Class: Equation Operating System

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  Classes of Jon Lawrence  >  Equation Operating System  >  Download .tar.gz .zip  >  Support forum Support forum  >  Blog Blog  >  RSS 1.0 feed RSS 2.0 feed Latest changes  
Name: Equation Operating System
Support forum Support forum
Base name: eos
Description: Solve equations with multiple variables
Related classes: , , , , , , ,
Version: -
PHP version: -
License: GNU General Public License (GPL)
All time users: 1511 users
All time rank: 2147
Week users: 0 users
Week rank: 1844
Picture of Jon Lawrence
Author: Jon Lawrence <e-mail contact>
Packages: 2 Browse this author's classes Browse this author's classes
Country: United States United States - PHP jobs in United States
Age: 27
All time rank: 914120 in United States United States
Week rank: 994 Down110 in United States United States Up
Innovation award
Innovation award
Nominee: 1x


  Detailed description  
This class solves equations with multiple variables.

It does not resort to the PHP eval() function to help prevent security risks of using malicious expression values for instance with a calculator that takes expressions defined by the users.

It comes with a sub-class that can produce graphic charts plotting the curve defined by the equation expression withing a given range of x and y values. The generate chart graphics can be outputted in the PNG or JPEG formats using the GD library.

 

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Group folder image Graphics Colors, images, charts and picture formats View top rated classes
Group folder image Math Math related classes. View top rated classes

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  Innovation Award  
PHP Programming Innovation award nominee
January 2005
Number 2
 Solving equations can have many applications, like for instance, drawing charts that represent the curves defined by assigning values of given ranges to the variables of the equations.

The PHP eval() function can be used to dynamically evaluate the expressions defined by an equation. However, it may be dangerous to evaluate an arbitrary expression provided by an user, as it may contain malicious code.

This class provides an alternative solution that consists in a full expressions parser and evaluator that only supports a limited set of operations that do not represent a security risk when the operations are evaluated.

Manuel Lemos

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  Trackback links  
Link Description
complex mathematical operations (Turkish) For these complex equations there is a class...
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  Applications that use this class  
Link Description
AAB Software Company web-site with an online graphing calculator
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  Files folder image Files  
File Role Description
Plain text file eos.class.php Class Main EOS Class
Plain text file index.php Example Example usage of graphing function
Plain text file stack.class.php Class Supporting 'stack' class

Download all files: eos.tar.gz eos.zip
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