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The most important feature from the point of view of Wiki charts, is that Gnumeric charts can be exported as graphics simply by right clicking anywhere on the finished chart and selecting Save as Image. A range of formats is supported, including SVG and PNG. The accompanying population chart is a typical result.
mw:Extension:Chart is being rolled out across some WMF wikis, with the aim of replacing the now deprecated mw:Extension:Graph.This page seeks to collate information on when, how and with what standards to create charts in articles on the English Wikipedia.
Many spreadsheet, drawing, and desktop publishing programs allow you to create graphs and export them as images. gnuplot can produce a wide variety of charts and graphs; see samples with source code at Commons. In Python using matplotlib ; The R programming language can be used for creating Wikipedia graphs.
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 explains its functions and use in extreme detail.
The chart is displayed as HTML tables using CSS attributes, and may contain arbitrary wiki markup within the boxes. This implementation was based on the now-deprecated {{ family tree }} template. Basic example
A logarithmic chart allows only positive values to be plotted. A square root scale chart cannot show negative values. x: the x-values as a comma-separated list, for dates and time see remark in xType and yType; y or y1, y2, …: the y-values for one or several data series, respectively. For pie charts y2 denotes the radius of the corresponding ...
A table is an arrangement of columns and rows that organizes and positions data or images. Tables can be created on Wikipedia pages using special wikitext syntax, and many different styles and tricks can be used to customise them.
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: ImageSize = width:450 height:305 The numbers 450 and 305 are pixel sizes of the image box.