# Latex note
- `\usepackage{package_name}`: import useful package
## macros
Predefine some useful custom command.
> Note: must be `\input` before `\begin{document}` ([description](https://www.overleaf.com/learn/latex/Errors/LaTeX%20Error:%20Can%20be%20used%20only%20in%20preamble))

### Usage

\input{macros}
\begin{document}
...

### We usually do...
- \newcommend:
- define a new function
- We have no way to determine what the proper noun is, we can temporarily define a command for it.

\usepackage{xifthen} %for \ifthenelse
\newcommand{\frameentropy}[1][]{%
    \ifthenelse{\equal{#1}{}}{Frame entropy}{frame entropy}%
}