Removing white space around tikz number line?

Question

I'm having this problem with tikz in which I'm trying to create this simple number line but a load of unnecessary white spaces pops up:

 \item
As a real-number-line graph:\\
    \begin{tikzpicture}
        \begin{axis}[
            axis x line=middle,
            axis y line=none,
            xtick={-3,-2,...,4,5}
        ]
            \addplot[line width=0.4mm, draw=blue][domain=-3:5]{0};
            \addplot[draw=blue, fill=white, mark=*] coordinates {(-3,0)(1,0)(5,0)};
        \end{axis}
    \end{tikzpicture}
\item
Interval Notation:\\

The result looks like this:

How would I remove all this white space? Also, why is there so much white space?

Thanks.

Answer 1

tikzpicture in has default height. You need to reduce it to some small value, but not to small (<16mm) since than you will receive error:

Package pgfplots Error: Error: Plot height `42.67912pt' is too small. This ca
nnot be implemented while maintaining constant size for labels. Sorry, label si
zes are only approximate. You will need to adjust your height..

See, if the following MWE gives what you like to have:

\documentclass{article}
\usepackage{pgfplots}

\begin{document}
\begin{enumerate}
\item   As a real-number-line graph:

\begin{tikzpicture}
    \begin{axis}[
height=20mm, width=90mm,    % <---
axis x line=bottom,
axis y line=none,
axis line style=-,          % <---
xtick={-3,-2,...,4,5},
ymin = 0, ymax = 1,         % <---
                ]
\addplot[draw=blue, thick, fill=white, mark=*]  
    coordinates {(-3,0) (1,0) (5,0)};
    \end{axis}
\end{tikzpicture}
\item   Interval Notation:
\end{enumerate}
\end{document}