About using \\ to wrap lines in latex mathematical formula

CornCreMiracle · March 23, 2022, 9:53am

Things I have tried

I tried to use \\ in inline and block mathematical formulas to wrap lines. It could work correctly in Typora but failed in Obsidian.

I think it may be because of the settings of MathJax. So I should change which item in Obsidian or MathJax to let \\ work likely in Typora.

Thank you!

\\ in Typora

\\ in Obsidian

chunned · March 23, 2022, 3:24pm

You have to specify that it’s an align environment in Obsidian

$$\begin{align}
first \\
second
\end{align}$$

Use an ampersand to specify where you want the align to be, e.g.

$$\begin{align}
x & = [something] \\
& = [something]
\end{align}$$

CornCreMiracle · March 24, 2022, 3:36am

Thank you very much.

Does this mean I can’t use \\ like in Typora? I have many notes written in Typora, which have many expressions like this. It’s really hard work to transform these notes.

chunned · March 24, 2022, 7:51pm

I’m by no means an expert on LaTeX, so I may be wrong, but AFAIK you would have to add the \begin{align}...\end{align} to your Typora notes when moving them to Obsidian.

I tried to write a Python script that would do this for you but I’m also not a Python expert so I couldn’t figure out how to make it work properly. I might return to it later if I have time.

chunned · March 24, 2022, 8:34pm

Alright I actually figured it out. This should be able to detect all .md files in a directory and basically change

$$
math stuff here
$$

to

$$\begin{align}
math stuff here
\end{align}$$

Note:

This will overwrite the file contents, so make a backup before you run it
Before you run the script, open it in a text editor (i.e. Notepad) and change line 3 to your target folder
This won’t touch files in subdirectories. You will have to change line 3 again and re-run the program for any notes in other directories or subdirectories

gist.github.com

https://gist.github.com/chunned/16208212c2cea3d0e6291868b39a7bd6

latex-aligner.py

import os
# MUST SET YOUR DIRECTORY ON THE FOLLOWING LINE - i.e. "C:\\Users\\User1\\Documents"
DIRECTORY = ""


def getFileNames():
    filelist = []   # List of files that we will work on is stored here
    files = os.listdir(DIRECTORY)   # Contains a list of all files in the directory
    for i in files:
        # Find all .md files, store names in filelist:

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readme.md

# Description
This script looks for Markdown files in a specified directory, and converts a normal LaTeX environment:
```
$$
...
$$
``` 
to an align environment:
```
$$\begin{align}

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I hope this helps!

CornCreMiracle · March 25, 2022, 12:19am

I don’t know how to express my appreciation. Thank you very much.

system · June 23, 2022, 12:19am

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