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Graphs, charts, and other pictures can contribute substantially to an article.Here are some hints on how to create a graph. The source code for each of the example images on this page can be accessed by clicking the image to go to the image description page.
The Google Chart API allows a variety of graphs to be created. Livegap Charts creates line, bar, spider, polar-area and pie charts, and can export them as images without needing to download any tools. Veusz is a free scientific graphing tool that can produce 2D and 3D plots. Users can use it as a module in Python.
If you want to set the viewing area and coordinate axes to use precise pixel dimensions, you have to 1) decompress the GGB file, 2) modify the decompressed XML file by hand, and 3) recompress everything again. It's a serious pain in the a**. Unfortunately, GeoGebra is the only program out there with its capabilities.
The Graph software extension allows the creation of graphs by use of the <graph>...</graph> parser tag. The graphs include bar charts, pie charts, line charts, area charts, scatter plots, tag clouds, tree maps, and political maps . Bar/line/area charts can be easily created by using Template:Graph:Chart; the documentation for this template ...
Both graphs show an identical exponential function of f(x) = 2 x. The graph on the left uses a linear scale, showing clearly an exponential trend. The graph on the right, however uses a logarithmic scale, which generates a straight line. If the graph viewer were not aware of this, the graph would appear to show a linear trend.
Each bar chart command is followed by an equal-sign ("="), while attributes are followed by a colon (":") as in the command "Period = from:0 till:2000" which sets the vertical (y-axis) range from 0 to 2000. The timeline commands to format the graph layout are: The numbers 450 and 305 are pixel sizes of the image box.
Graphs are important for an encyclopaedia. I am surprised that this project page did not exist given the importance of graphs for an encyclopaedia. The probably should be a Wikipedia:WikiProject Graphs to coordinate the task of getting consistent looking graphs throughout Wikipedia. -- Alan Liefting ( talk) - 07:32, 18 September 2008 (UTC) [ reply]
Graphs in books tend to use LaTeX conventions, but yet again there are wide variations. For ease of reference diagrams and graphs should use the same conventions as the text that refers to them. If there is a better illustration with a different convention, though, the better illustration should normally be used.