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+\documentclass{article}
+
+\usepackage{fouriernc}
+\usepackage[utf8]{inputenc}
+\usepackage{nl-interval}
+\usepackage{indentfirst}
+\usepackage{fancyvrb}
+\usepackage{siunitx}
+
+\title{The {\bf nl-interval} package}
+\author{Antero Neves}
+\date{12 March 2021 \quad version 1.0}
+
+\begin{document}
+ \maketitle
+
+ \begin{abstract}
+ This is a \LaTeX\ package that aims to simplify and agilize the process of representing intervals in the real axis.
+ Four commands are provided: \verb*|\nlAxisX|, \verb*|\nlnuminf|, \verb*|\nlinfnum| and \verb*|\nlnumnum|, they were built around the packages {\bf tkz-fct}, {\bf ifthen} and {\bf xparse} and require being used inside a \verb*|tikzpicture| environment.
+ \end{abstract}
+
+
+ \section{How to use}
+
+ \subsection{How to load the package}
+
+ The package is loaded as usual, through the command
+
+ \medskip
+
+ \verb*|\usepackage{nl-interval}|
+
+ \medskip
+
+ There are, at this time, no options available to include here.
+
+ \subsection{The commands}
+
+ The first command is \verb*|\nlAxisX| and it simply draws the \(x\) axis where the intervals are going to be represented. It has two mandatory inputs: the minimum and maximum of the axis, so, the full instruction is: \Verb*|\nlAxisX{min}{max}|:
+
+
+ \begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \end{tikzpicture}
+ \end{Verbatim}
+
+
+ would give the output:
+
+ \medskip
+
+ \begin{center}
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \end{tikzpicture}
+ \end{center}
+
+
+ After the axis is drawn, one can start placing the intervals. To do this we will consider two kinds of intervals, the ones with infinity, either \(-\infty\) or \(+\infty\) and the ones with two numbers.
+
+ \newpage
+
+
+ Let's start with the first group.
+
+ \begin{itemize}
+ \item \verb*|\nlinfnum| will draw intervals of the kind: \(\left]-\infty, number\right]\) or \(\left]-\infty, number\right[\).
+ \item \verb*|\nlnuminf| will draw intervals of the kind: \(\left[number, +\infty\right[\) or \(\left]number, +\infty\right[\).
+ \end{itemize}
+
+ These two commands also have two mandatory inputs: first one is the number ({\it always a decimal representation, so, something like \(\pi\) doesn't work but there is a workaround!}) and the second if it's an \underline{o}pen or \underline{c}losed interval at the number. So, for instance
+
+ \medskip
+
+ \begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnuminf{3}{o}
+ \nlinfnum{1}{c}
+ \end{tikzpicture}
+ \end{Verbatim}
+
+ gives us
+
+ \medskip
+
+
+ \begin{center}
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnuminf{3}{o}
+ \nlinfnum{1}{c}
+ \end{tikzpicture}
+ \end{center}
+
+ This time, there are a few optional inputs, the full commands are like this:
+
+ \begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \nlnuminf[1]{number}[2]{o or c}[3]
+ \nlinfnum[1]{number}[2]{o or c}[3]
+ \end{Verbatim}
+
+ \begin{itemize}
+ \item in [1] you can put options like different colours or patters used;
+ \item in [2] you can substitute the number for a letter or an exact representation of the number, don't put it in math environment!;
+ \item in [3] you can change the height of the interval, which is \(0.5\si{\centi\meter}\) by default.
+ \end{itemize}
+
+
+ Let's try some of these options:
+
+ \begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+ \nlinfnum[red!20]{3.1416}[\pi]{o}
+ \end{tikzpicture}
+ \end{Verbatim}
+
+
+ \begin{center}
+ \begin{tikzpicture}
+ \nlAxisX{-1}{4}
+ \nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+ \nlinfnum[red!20]{3.1416}[\pi]{o}
+ \end{tikzpicture}
+ \end{center}
+
+
+\newpage
+
+The second group of intervals, works with a single command:
+
+\begin{itemize}
+ \item \verb*|\nlnumnum|
+\end{itemize}
+
+and, since it uses two numbers, we have four mandatory inputs: the numbers and the instruction of closed or open. It works like this:
+
+
+\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnumnum{-1}{o}{3}{c}
+ \end{tikzpicture}
+\end{Verbatim}
+
+ \begin{center}
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnumnum{-1}{o}{3}{c}
+ \end{tikzpicture}
+ \end{center}
+
+As with the previous commands, there are a few options, this time we have one more which allows us to change what is shown in the second number:
+
+
+\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+ \end{tikzpicture}
+\end{Verbatim}
+
+
+\begin{center}
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+\end{tikzpicture}
+\end{center}
+
+
+\section{Conclusion}
+
+This is a really simple package (my first attempt at a package) but one that, I hope, can help you draw stuff like:
+
+\begin{center}
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+ \nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+ \nlinfnum{2}{o}[.3]
+ \end{tikzpicture}
+\end{center}
+
+somewhat quickly and easily. By the way, the instructions for this are:
+
+\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+ \begin{tikzpicture}
+ \nlAxisX{-2}{5}
+ \nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+ \nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+ \nlinfnum{2}{o}[.3]
+ \end{tikzpicture}
+\end{Verbatim}
+
+
+\end{document} \ No newline at end of file