Initial Query

In latex when I force a newline in a caption with \\ it gives an error saying \Hy@tempa has an extra } runaway argument?

LLM Generation

Query

In latex when I force a newline in a caption with \\ it gives an error saying \Hy@tempa has an extra } runaway argument?

Output

# LaTeX Caption Line Break Error The error you're encountering is a common issue when trying to use `\\` in captions while the `hyperref` package is loaded. The problem occurs because `hyperref` processes caption text for bookmarks/links, and the unprotected line break command interferes with this process. ## Solutions: ### 1. Use `\protect\\` (Recommended) 

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\caption{First line \protect\\ Second line}
This prevents the `\\` command from being expanded during hyperref processing. ### 2. Use a short caption for the list of figures 
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\caption[Short caption for TOC]{First line \\ Second line}
### 3. Use a `\parbox` or `minipage` 
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\caption{\parbox{\linewidth}{First line \\ Second line}}
### 4. Use the `caption` package 
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\usepackage{caption}
\captionsetup{singlelinecheck=false}
### 5. Try `\newline` instead of `\\` 
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\caption{First line \newline Second line}
The first solution with `\protect\\` is usually the simplest and most effective approach.

Substring Evaluation

Testing if the previous output contains the string \protect: True

Initial Query

In latex when I force a newline in a caption with \\ it gives an error saying \Hy@tempa has an extra } runaway argument?

LLM Generation

Query

In latex when I force a newline in a caption with \\ it gives an error saying \Hy@tempa has an extra } runaway argument?

Output

# LaTeX Caption Line Break Error ## The Problem When you try to force a line break in a LaTeX caption using `\\`, you encounter an error related to `\Hy@tempa` having an extra `}` or a runaway argument. This happens because the `hyperref` package (which creates PDF bookmarks) can't handle line breaks in the bookmark text it generates from your captions. ## Solutions Here are several ways to fix this issue: ### 1. Use the optional caption argument 

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\caption[Short caption for TOC]{Long caption with \\ line breaks}
The text in the square brackets is used for the table of contents and bookmarks (without line breaks), while the text in curly braces appears under your figure/table. ### 2. Protect the line break 
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\caption{Caption with \protect\\ line breaks}
The `\protect` command prevents the expansion of `\\` when hyperref processes the bookmark. ### 3. Use the caption package 
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\usepackage{caption}
\captionsetup{singlelinecheck=off}
This disables the single-line centering feature that can cause problems with line breaks. ### 4. Use paragraph formatting instead 
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\caption{\parbox{\linewidth}{This is a long caption that will break
naturally without using explicit line breaks.}}
## Example 
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\documentclass{article}
\usepackage{graphicx}
\usepackage{hyperref}

\begin{document}

% Method 1: Separate TOC caption
\begin{figure}
    \centering
    \includegraphics[width=0.5\textwidth]{example-image}
    \caption[Short caption for TOC]{Line one \\ Line two}
\end{figure}

% Method 2: Protect the line break
\begin{figure}
    \centering
    \includegraphics[width=0.5\textwidth]{example-image}
    \caption{Line one \protect\\ Line two}
\end{figure}

\end{document}
The first method is generally preferred as it also gives you control over how your caption appears in the table of contents.

Substring Evaluation

Testing if the previous output contains the string \protect: True