Editing Bar chart (section)

===Variable-width (variwide)===
[[File:20210626 Variwide chart of greenhouse gas emissions per capita by country.svg|thumb|'''Example:''' Variable-width bar chart relating:
<br>* countries' respective populations (along ''x'' axis), 
<br>* per-person CO2 emissions 1990-2018 (along ''y'' axis), and 
<br>* total emissions for that country (rectangle area = product ''<code>x*y</code>'' of sides' lengths)]]

Variable-width bar charts, sometimes abbreviated ''variwide'' (bar) charts, are bar charts having bars with non-uniform widths. Generally:
* Bars represent quantities with respective rectangles of areas ''A'' that are respective [[Product (mathematics)|arithmetic products]] of related pairs of
:::— vertical-axis quantities (''A/X'') and
:::— horizontal-axis quantities (''X'').
* Arithmetically, the area of each bar (rectangle) is determined a product of sides' lengths:
::''<code>(A/X)*X</code> = Area A'' for each bar
Roles of the vertical and horizontal axes may be reversed, depending on the desired application.

Examples of variable-width bar charts are shown at [https://commons.wikimedia.org/wiki/Category:Variable-width_bar_charts Wikimedia Commons].