> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/zh-tw/latex-cuo-wu/23-misplaced-alignment-tab-character.md).

# 對齊定位字元 & 放置位置錯誤

當對齊字元「&」使用不當時，就會出現此錯誤。對齊字元 *&* 是用於在特定環境中對齊元素，例如 *矩陣*, *align*, *表格* 等。

## 錯誤的常見原因

**未寫成 \\&：**

當你想使用與號 *&* 作為文字字元寫在內容中，例如標題裡，你必須將其寫成 `\&`。如果你沒有這樣做，就會出現如下所示的錯誤

```latex
這家公司名為 `Michael & Sons'
```

main.tex，第 5 行

對齊標記字元 & 放置錯誤。

l.5 這家公司名為 \`Michael & Sons' 我想不通你為什麼會想在這裡使用製表符。如果你只是想要一個與號，解法很簡單：現在只要輸入 \`I\\&' 即可。不過，如果上方某個右大括號過早結束了先前的對齊，你大概還會遇到更多錯誤訊息，而且你可以試著現在輸入 \`S'，看看還剩下哪些可挽救的部分。\[1

若要修正此錯誤，請將 `&` 到 `\&`.

**使用了 Matrix 巨集，而不是 amsmath:matrix：**

在基本的 LaTeX 發行版中，有一個名為 *矩陣*。這通常會被錯誤使用，而你真正想用的是 *環境* 由該套件提供的矩陣 *amsmath* 套件。如果你忘了載入 amsmath 套件，只是寫

```latex
$$
\begin{matrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{matrix}
$$
```

那麼就會出現一則 *對齊標記放置錯誤* 的錯誤訊息。這是因為這不是使用 *矩陣* LaTeX 發行版所提供的巨集的正確方式。若要解決此問題，只要載入 *amsmath* 套件。

```latex
% 在導言區（\begin{document} 之前）
\usepackage{amsmath}

% 在你的文件中

$$
\begin{matrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{matrix}
$$
```

![Amsmathmacro.PNG](/files/148ddbbeda3fe5fd528e11140c25d8836b25cd23)


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