如何制作内联 pgfplot

Question

我有以下代码来绘制高度为 2em 的函数图，并与一些文本一致，但它给出了错误。

\documentclass{article}
\usepackage{pgfplots}

\newcommand\quadratic{
  \begin{tikzpicture}
    \begin{axis}[axis lines=none,height=2em]
      \addplot[mark=none]{x^2};
    \end{axis}
  \end{tikzpicture}}

\begin{document}
This image \quadratic is a quadratic.
\end{document}

---

Package pgfplots Error: Error: Plot width `23.1882pt' is too small.
This cannot be implemented while maintaining constant size for labels.
Sorry, label sizes are only approximate. You will need to adjust your width.

考虑到我已经删除了标签，这有点愚蠢。我想要这样的输出：

Answer 1

如果设置scale only axis，则没有最小高度：

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\newcommand\quadratic{%
  \begin{tikzpicture}
    \begin{axis}[hide axis, scale only axis, height=2ex]
      \addplot[mark=none]{x^2};
    \end{axis}
  \end{tikzpicture}}

\begin{document}
This image \quadratic{} is a quadratic.
\end{document}