How do I make a reference to a figure in markdown

问题:

I'm currently writing a document in markdown and I'd like to make a reference to an image from my text.

this is my text, I want a reference to my image1 [here]. blablabla

![image1](img/image1.png)

I want to do that reference because after converting my markdown to pdf, images get placed in one or two pages after and the document doesn't make any sense.

UPDATE:

I've tried Ryan's answer in that post and I can't make it working. Apparently the code :

[image]: image.png "Image Title" 
![Alt text][image] 
A reference to the [image](#image).

should produce:

\begin{figure}[htbp] 
\centering 
\includegraphics[keepaspectratio,width=\textwidth,height=0.75\textheight]{i mage.png} 
\caption{Alt text} 
\label{image} 
\end{figure} 

A reference to the image (\autoref{image}).

instead, I obtain:

\begin{figure}[htbp]
\centering
\includegraphics{image.png}
\caption{Alt text}
\end{figure}

A reference to the \href{\#image}{image}.

I've noticed two problems :

• \label{image} doesn't appear : no reference is created.
• (\autoref{image}) becomes \href{\#image}{image} : no cross reference is detected.

And then, when I convert that to pdf it obviously doesn't link to the image. There's a link, but it doesn't link to anything.

Any help would be much appreciated!!

回答1:

In pandoc you can even do:

![This is the caption\label{mylabel}](/url/of/image.png)
See figure \ref{mylabel}.

回答2:

I've had a chat with Ryan Gray after reading his answer in a similar post. Actually his solution of using :

[image]: image.png "Image Title" 
![Alt text][image] 
A reference to the [image](#image).

is only adapted when using multimarkdown.

When it comes to pandoc, the only solution to make cross references is using directly latex keywords:

[image]: image.png "Image Title"
![Alt text \label{mylabel}][image]
See figure \ref{mylabel}.

回答3:

You can use the pandoc-fignos filter for figure numbering and referencing. It works with any output format -- not just LaTeX.

Add a label to the image's attributes like this:

 ![Caption.](image.png) {#fig:description}

... and then reference the figure like this:

 @fig:description

Information on how to install and apply the pandoc-fignos filter is given on its Web page. There is also the pandoc-eqnos filter for doing the same kind of thing with equations.

回答4:

Pandoc supports referencing sections (via section identifiers prefixed by #).

Comments on this open issue describe how the following workaround leverages section identifiers for generating image references in LaTeX and HTML:

<div id="fig:lalune">
![A voyage to the moon\label{fig:lalune}](lalune.jpg)

</div>

[The voyage to the moon](#fig:lalune).

The empty line before </div> is required.

回答5:

Assuming that you want PDF output of Pandoc at the end:

The best solution for inserting images and changing their attributes I found is:

\begin{figure}[H]
\includegraphics[width=0.25\textwidth, height=!]{images/path.png}
\centering
\caption{mycaption}
\end{figure}

and in my template.latex I have:

\usepackage{wrapfig}
\usepackage{float}

Other solutions cannot specify the image width or height, at least not in standard markdown. However it is often essential for something like a book or a paper to specify the dimensions of figures, except you want to configure output size of images before using them in your document. In that case you'd have to deal with different settings for those tools you use to create the images.

I recommend in case of Matplotlib to export to PDF and then use the code I posted. This will give the best image quality and highest flexibility in configuring what the image will look like in the output PDF, without having to worry about stuff.