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Plot & use
Plot upto 3 functions (or their Derivatives/Integrals!) and save as a single image file.
Insert these graphs from workspace into any webpage, or download and use.
This simple to use function plotter is based on a great webbased plotting tool "openPlaG".
Examples
norm(0#1#x), trid(1#2#4#x), pon(1#x),  Inserting such links is easy. Type in the function, convert the function text into a link. Set Link URL as 1 or 2 or 3 for plotting it as function 1 or 2 or 3. Important: Use Advanced tab in Insert/Edit Link popup to set link class as "plot" (without quotes, off course).

For details of the example functions, see the plot help. Notice that function arguments are separated by "#", not by comma 
See also
There are several online tools available for plotting functions. See, for example, "Online function grapher", "Graphical Function Explorer", "Interactive mathematics", "2D/3D function plotter", "FooPlot", "Function plotter",
[Note: Creating graphs from data points is done by charting tools (e.g. "Flot", "jqPlot", "DyGraphs", "jsxGraph".)]