openPlaG is a
PHP
PHP is a general-purpose scripting language geared toward web development. It was originally created by Danish-Canadian programmer Rasmus Lerdorf in 1993 and released in 1995. The PHP reference implementation is now produced by The PHP Group. ...
based function graph plotter for use on websites. It was first released in April 2006. In June 2007 its source code was published under the
GNU GPL license. PlaG is an abbreviation for Plot a Graph.
The current version 3.2 of openPlaG allows the display of up to three
function graphs, their
derivative
In mathematics, the derivative of a function of a real variable measures the sensitivity to change of the function value (output value) with respect to a change in its argument (input value). Derivatives are a fundamental tool of calculus. ...
and their
integral
In mathematics, an integral assigns numbers to functions in a way that describes displacement, area, volume, and other concepts that arise by combining infinitesimal data. The process of finding integrals is called integration. Along wit ...
. It can compute several different functions, with a focus on a large function variety and on
probability functions. Settings for a graph can be saved and loaded. A substitution for a user-defined formula can be used. It has an instruction page, which explains the use of the plotter and the function syntax.
About 180 functions are predefined. These belong to the categories basic functions,
trigonometric
Trigonometry () is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. ...
and
hyperbolic function
In mathematics, hyperbolic functions are analogues of the ordinary trigonometric functions, but defined using the hyperbola rather than the circle. Just as the points form a circle with a unit radius, the points form the right half of the u ...
s, non-differentiable functions, probability functions, special functions, programmable functions,
iteration
Iteration is the repetition of a process in order to generate a (possibly unbounded) sequence of outcomes. Each repetition of the process is a single iteration, and the outcome of each iteration is then the starting point of the next iteration. ...
s and
fractals, differential and integral equations.
See also
List of information graphics software
This is a list of software to create any kind of information graphics:
* either includes the ability to create one or more infographics from a provided data set
* either it is provided specifically for information visualization
Vector graphics
V ...
References
External links
openPlaG in FSF/UNESCO Free Software Directoryfreshmeat listingopenPlaG download page*
Free plotting software
Plotting software
Fractal software
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