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Latex combines multiple subgraphs

2022-07-22 04:30:00 【V, Chao】

20210413 -

0. introduction

Recently in use latex Write a paper , This kind of halfway monk , Many contents need to be checked on site . Can't , Who wants to use less at ordinary times . This article aims at placing subgraphs , That is to put multiple pictures in the article , These pictures essentially belong to the same big picture , The assumption is 3 individual , That's it 3 Subtext , Horizontally distributed in this line .

Although I checked a lot yesterday , But in the end, many are not applicable , The general grammatical structure is clear , It's just that some details are not well understood . In this article, let's briefly record this process .

1. To solve the process

1.1 Starting plan

This part comes from Overleaf Official documents of [1], The introduction was quite detailed , On the first code .

\usepackage{caption}
\usepackage{subcaption}

\begin{figure}
     \centering
     \begin{subfigure}[b]{0.3\textwidth}
         \centering
         \includegraphics[width=\textwidth]{graph1}
         \caption{$y=x$}
         \label{fig:y equals x}
     \end{subfigure}
     \hfill
     \begin{subfigure}[b]{0.3\textwidth}
         \centering
         \includegraphics[width=\textwidth]{graph2}
         \caption{$y=3sinx$}
         \label{fig:three sin x}
     \end{subfigure}
     \hfill
     \begin{subfigure}[b]{0.3\textwidth}
         \centering
         \includegraphics[width=\textwidth]{graph3}
         \caption{$y=5/x$}
         \label{fig:five over x}
     \end{subfigure}
        \caption{Three simple graphs}
        \label{fig:three graphs}
\end{figure}

The effect that the above code can achieve is as follows .
Insert picture description here
The picture above , That is the result I want , Then record the code separately .
1） Load the library
Although the above code uses two , But in practice , Only use subcaption It's OK, too .
2） Subgraph environment
The environment part of the subgraph is the most important , Different from the single image loading environment , When referring to many articles , It is precisely because these parts are not well understood , So it's not very right to use .

     \begin{subfigure}[b]{0.3\textwidth}
         \centering
         \includegraphics[width=\textwidth]{graph1}
         \caption{$y=x$}
         \label{fig:y equals x}
     \end{subfigure}

This control symbol [b] At present, I'm not sure what it means , I think it should be with ht The same meaning , however botom Words , What does it mean for a subgraph ？ incomprehension .
{0.3\textwidth} This sentence refers to setting the width of each subgraph to 0.3\textwidth, That is, the width of the document 0.3. If you want several subgraphs to be the same , Then we must ensure that their width and sum are less than \textwidth; Also consider the spacing between the graphs .
width=\textwidth This sentence is more obvious , To specify the width of the subgraph , It should be noted that , Here has become the front 0.3\textwidth, Because the environment is limited .

3) Line up
If the picture is on one line , Then you need to add ~ perhaps \hfill These commands are used to fill in two pictures without line breaks , Or fill in nothing directly , As long as the width is enough ; If you want a new line , Leave a blank line .

The above code understands what it means , But I'm not satisfied with the interval between the two pictures , I went on to find other content .
（Overleaf The example given in the official website document of is very good , I have found the answer I want from this website many times ）

1.2 Further reduce the horizontal space

First, review Latex Length information in [3], Then ask and answer [2] Found the answer . Question and answer [2] There are three solutions , Maximum length , Equal length , Fixed length . This time, a fixed length is used .

\centering
  \subcaptionbox{3a\label{fig3:a}}{\includegraphics[width=1.6in]{example-image-c}}\hspace{1em}%
  \subcaptionbox{3b\label{fig3:b}}{\includegraphics[width=1.6in]{example-image-c}}

Don't pay attention to the inserted picture or title , Just pay attention to the interval ,\hspace{1em}%, In length information [3] Can be seen in ,1em Is under the current font size , A capital M The amount of space occupied ; But even so , The key part here is the later one %, Get rid of this thing , Or wrap this part , Can not achieve a relatively small space .

Specifically % What's the function , Always feel [2] What is said in is not clear enough .
（ Solved the problem for the time being , Then continue to work first ）