Latex Comment
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31. December 2007
by tom
14 Comments
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You probably know how to add comments in Latex using the reserved character % .
Many LaTeX editors provide functionality to comment/uncomment entire paragraphs of your document. However, what if you are using a basic text editor or prefer not to use a menu button?
The comment package solves this by defining the comment environment. Any content within the opening and closing statements is not displayed in the final document.
It is important that the opening and closing commands appear on a separate line without whitespace characters. You might get the following error otherwise:
Fancy LaTeX chapter styles 3. July 2012 In "Introduction"
although I suppose it might be a pure TeX command
I’ve grown quite fond of the comment environment, as it allows you to turn on and turn off the commented text. In particular, I now use it for assignments to generate the version with and without solution sets. I put the answers in section blocks like this
and for the version without the solutions, I just include the line
To be fancier, and show the answers set off in shaded boxes, I also use the color and framed packages:
as comment allows you to, when showing the commented block, set it in any environment:
\specialcomment{answer}{\begin{shaded}}{\end{shaded}}
Nice, thanks for your comment. Great stuff!
Another way is to define a new command
A lot, commenting the \begin{comment} and \end{comment} out (by adding % before them) to disable them. Easily switch on/off bits of text that way.
Thanks for your comment with the example. That’s a nice way to include/exclude the comments.
I tried to compile the following code and it does not seem to run. I used exactly the same code as yours.
Be cautious. This bug caught me 20 minutes. I have no idea what lead to this.
Thanks for your comment. The problem is with the whitespace/tab character in front of the opening and closing statement of your comment environment. I updated the post to make this clearer.
I also found out that, the problem only exists when I was trying to compile the tex file using WinEdt. I switched to Vim-Latex Suite lately and the issue no longer occur in the new setting. Quite strange.
That’s strange indeed. Anyway, it seems you found a solution that works for you. Best, Tom.
Is it possible to make a comment within another comment?
Something like:
What sort of behavior would you expect? Could you be more specific?
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WordPress has the ability to insert LaTeX math displays (e.g. ) into both posts and comments. The format for this is “$latex [Your LaTeX code] $” (but without the brackets, of course). See this announcement for details.
There used to be a number of quirks with the WordPress LaTeX plugin, but they have now largely been fixed. If you find any problems, please report them at this page .
WordPress also supports a certain amount of HTML . As a consequence, be careful with using the < and > signs in a comment, they may be misinterpreted as HTML tags! You can use < and > instead. (Inside of a LaTeX environment, you can use \lt and \gt.)
In case a comment really gets mangled up by formatting errors, contact one of the moderators of the polymath project, so that he or she can manually correct it.
The comments to this post will serve as the LaTeX help forum and LaTeX sandbox for this blog. If you want to test out some LaTeX code in the comments below, you may wish to first describe the code without the “latex” symbol in order to show other readers what you are doing. For instance: “Here is a LaTeX test: $a^n+b^n=c^n$ becomes “. (Note that one can also mouse over a compiled LaTeX image to recover the original LaTeX source.)
Comment by Anonymous — October 17, 2011 @ 2:15 pm
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Comment by M Wall — June 20, 2013 @ 8:44 am
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This might be an obvious question, but to have a sunflower with three petals, is to find three sets , so that , and .
What happens if instead of both properties, just one of them is forbidden? For example, if we forbid three sets in our family, so that ?
Comment by ILan — November 8, 2015 @ 2:59 pm
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The \gt and \lt don’t seem to be working: I’m trying to compile $a \gt b$: a>b$ works, see
Comment by Anonymous — March 7, 2016 @ 3:01 pm
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I will try to use Latex to express the process but there is no telling how it will turn out
Comment by PJKar — May 24, 2016 @ 8:21 pm
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Comment by Anonymous — December 11, 2016 @ 6:21 pm
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Comment by junkmailer — February 10, 2017 @ 7:21 pm
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This is a test:
$latex[x^2 + \phi]$
Comment by Anonymous — March 7, 2017 @ 4:35 am
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I think I understand now. For the operator norm question, has eigenvalues which are bounded above by .
For the positive definite imaginary part, I am still a bit confused. The imaginary part of does not even seem to be Hermitian. But I think I see how to get the conclusion that follows anyway: The eigenvalues above have positive imaginary part . Using the fact that has an orthogonal eigenbasis, you can now calculate that the has a nonnegative imaginary part for any .
Is this what it means for the imaginary part of $\latex R$ to be positive definite?
Comment by hhh — March 19, 2017 @ 6:11 pm
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I think I understand now. For the operator norm question, has eigenvalues which are bounded above by .
For the positive definite imaginary part, I am still a bit confused. The imaginary part of does not even seem to be Hermitian. But I think I see how to get the conclusion that follows anyway: The eigenvalues above have positive imaginary part . Using the fact that has an orthogonal eigenbasis, you can now calculate that the has a nonnegative imaginary part for any .
Is this what it means for the imaginary part of $\latex R$ to be positive definite?
Comment by hhh — March 19, 2017 @ 6:12 pm
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This proposition is true, though you’re quite right that I should have mentioned it. Here’s a proof sketch: If is immodest, then it generates what I called in the proof of Proposition 2 an ‘immodest S5’ Kripke frame—i.e., the relation partitions into equivalence classes, where each equivalence class . Then, for each pair of worlds , either (if ) or (if ). So, for each ,
And thus, if you treat as a local expert,
Comment by jdmitrig — June 19, 2017 @ 10:04 pm
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Comment by min — November 13, 2017 @ 3:09 pm
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Comment by Any — February 7, 2018 @ 1:18 pm
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\displaystyle \sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}
hotmail account
Comment by hotmail123 — June 5, 2018 @ 9:47 am
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Comment by Anonymous — September 16, 2018 @ 7:43 pm
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Comment by Anonymous — September 16, 2018 @ 7:47 pm
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This is a latex test:
$e^x = 1 + x + /frac {x^2} {2!} + . . . $
Comment by Anonymous — April 23, 2019 @ 1:59 am
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Comment by Anonymous — May 12, 2019 @ 3:02 pm
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\displaystyle \ 28,19-20-0,28 = 7,91 &s=3
Comment by Igor Moreira — June 2, 2019 @ 5:58 pm
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Comment by Angela Chan — September 26, 2019 @ 7:18 am
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Comment by dahaiyi — January 12, 2020 @ 1:54 pm
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Comment by martinskirossinski — March 24, 2020 @ 1:11 am
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[…] For those who want to experiment with what LaTeX does and doesn’t work in comments, you can experiment here. […]
latex$ “\frac{\mathrm{d} y }{\mathrm{d} x} = \lim_{\delta \rightarrow 0} \delta y /\delta x”$
Comment by sr — April 27, 2020 @ 6:46 am
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https://texblog.org/2007/12/31/commenting-in-latex/
https://polymathprojects.org/how-to-use-latex-in-comments/
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Latex Comment
