Latex插图的命令是includegraphics[选项]{文件} 该命令详情
找到命令关键词，去此网站查找，如subfigure
subfigure 英文的overleaf 官方文档搜索代码更佳
例如（编辑器中会自动补全代码，有的参数要赋值，默认有等号）：

includegraphics[width=textwidth,viewport=10 10 600 600,clip]{./figure/test3.png}
width=textwidth, 将所插入图形缩放到和文本行的宽度一样宽。
viewport=10 10 600 600,clip ， 输入左上角向右下角坐标，具体可以查看生成图片尺寸；clip表示只显示裁剪出的部分
includegraphics[width=textwidth]{graphics.eps}
将所插入图形缩放到和文本行的宽度一样宽。

includegraphics[width=0.80textwidth]{graphics.eps}
使得插入图形的宽度为文本行宽的 80%。当与 calc 宏包配合使用 时，下面的命令可令图形的宽度比文本行宽少 2 英寸：

usepackage{caption}
usepackage{subcaption}

begin{figure} % 双栏时使用 {figure*}
     centering
     begin{subfigure}[b]{0.3textwidth}
         centering
         includegraphics[width=textwidth]{graph1}
         caption{$y=x$}
         label{fig:y equals x}
     end{subfigure}
     hfill
     begin{subfigure}[b]{0.3textwidth}
         centering
         includegraphics[width=textwidth]{graph2}
         caption{$y=3sinx$}
         label{fig:three sin x}
     end{subfigure}
     hfill
     begin{subfigure}[b]{0.3textwidth}
         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}

figure参数

Parameter Position
h-=-=-=Place the float here, i.e., approximately at the same point it occurs in the source text (however, not exactly at the spot)
t-=-=-=Position at the top of the page. b Position at the bottom of the page.
p-=-=-=Put on a special page for floats only.
!-=-=-=Override internal parameters LaTeX uses for determining “good” float positions.
H-=-=-=Places the float at precisely the location in the LATEX code. Requires the float package, though may cause problems occasionally. This is somewhat equivalent to h!.

labels and 交叉引用

图和公式表格一样，可以被其它文本引用。交叉引用非常简单，只需要在figure环境添加一个label，然后再用这个label指向该图片。

begin{figure}[h]
    centering
    includegraphics[width=0.25textwidth]{mesh}
    caption{a nice plot}
    label{fig:mesh1}
end{figure}

As you can see in the figure ref{fig:mesh1}, the 
function grows near 0. Also, in the page pageref{fig:mesh1} 
is the same example.

https://www.overleaf.com/learn/latex/Inserting_Images#Generating_high-res_and_low-res_images
label{fig:mesh1}
This will set a label for this figure. Since labels can be used in several types of elements within the document, it’s a good practice to use a prefix, such as fig: in the example.
ref{fig:mesh1}
This command will insert the number assigned to the figure. It’s automatically generated and will be updated if insert some other figure before the referenced one.
pageref{fig:mesh1}
This prints out the page number where the referenced image appears.

最后

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