# Zim - A Desktop Wiki

# Equation Editor

The equation editor is a simple dialog that allows you to insert equations into a page using **latex**.

**Dependencies:** This plugin requires a Latex suite to be installed as well as the "dvipng" application. In specific the "`latex`" and "`dvipng`" commands should be available in the system path. Additionally, if the dark mode preference is activated, the TeX package "xcolor" must be installed (included in most TeX distributions).

## Preferences

- The option
**Use font color for dark theme**sets an template variable to change the color scheme of the equations - The option
**Font size**sets the fonts size for the template in points - The option
**Equation image DPI**sets the DPI value with which the equation is generated as an images

## Template

You can control the look of the equations using the special template "`plugins/equationeditor.tex`"". See Help:Templates for more information about template syntax.

There are variables that can be used in this template:

- "
`equation`" which will be replaced with the content from the dialog - "
`dark_mode`" which allows the user to generate equations appropriate for dark mode themes and reflects the setting of the**Use font color for dark theme**preference setting - "
`font_size`" gives the value for the font size selected by the user in the preferences

## Syntax

Some quick examples of the latex math syntax. For a complete reference see the links below:

c = \sqrt{ a^2 + b^2 } \int_{-\infty}^{\infty} \frac{1}{x} \, dx f(x) = \sum_{n = 0}^{\infty} \alpha_n x^n x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a} \hat a \bar b \vec c x' \dot{x} \ddot{x}

## References

- Micheal Downes,
*Short Math Guide for LaTeX*, American Mathematical Society, 2002 [1] - Tobias Oetiker e.a,
*The Not So Short Introduction to LATEX2e*, 2007 [2]

- [1] http://www.ams.org/tex/amslatex.html
- [2] http://www.latex-project.org/guides/
- https://en.wikipedia.org/wiki/Help:Formula (latex parts only)