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Class: Equation Operating System


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      Classes of Jon Lawrence  >  Equation Operating System  >  Download  >  Support forum Support forum  >  RSS 1.0 feed RSS 2.0 feed Latest changes  >  Stumble It! Stumble It!  >  Bookmark in del.icio.us Bookmark in del.icio.us  
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  • Supplied by:

    Picture of Jon Lawrence
    Name: Jon Lawrence <e-mail contact>
    Published packages: 2
    Country: United States United States - PHP jobs in United States
    Home page: http://www.aab-software.com/
    Age: 24
    All time rank: 832
    Week rank: 1685

    Browse this author's classes

  • 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

  • Groups:

    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

  • 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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    274
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  • Applications that use this class:

    Link Description
    AAB Software Company web-site with an online graphing calculator
    Add link image If you know an application of this package, send a message to the author to add a link here.

  • 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
    NOTICE: if you are using a download manager program like 'GetRight', please Login before trying to download this archive.

 
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