Yesterday, I published a post about opamps here on the blog. This post utilized a new feature here at Adafruit: rendered LaTeX equations. For those that are unfamiliar, LaTeX is a markup language for the TeX system, originally developed by legendary computer scientist Donald Knuth. LaTeX (pronounced “Lay-Tek”), is used by scientists, educators and engineers around the world to format equations so that they look nice and neat, and are easy to read.

About a month ago, in the course of originally drafting that opamp article, I started looking around at LaTeX plugins for WordPress. There are several of these available. All of them have their strengths and weaknesses, but eventually I settled on WP-QuickLaTeX by Pavel Holoborodko, Dmitriy Gubanov and Kim Kirkpatrick.

WPQL supports automatic equation numbering, has built in tikz and pgfplots support, can render alpha-channel PNGs, and supports LaTeX markup in blog comments, which means that the conversation can go both ways. TeX and LaTeX have been around a long time, so there is information all over the place about how to use it, but here are a few tutorials (1, 2)

What this means for you is that we can more easily do technical posts on the blog, and drop transfer functions like this:

(1)

Or plots like this:

We’re super-excited to have this new functionality here, and we hope you are too. **If you want to take LaTeX for a test drive in the comments, you can use the [latex] and [/latex] tags at the beginning and end of your LaTeX statements.** If you want to make sure your code works before you post it, you can test it at quicklatex.com (include the preamble under “choose options” — thanks, zerth!)

Try it out now!

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## 18 Comments

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w00t!

hmmm…

\[ \cos(\theta + \phi) = \cos \theta \cos \phi

- \sin \theta \sin \phi \]

$sigh$

Oops, missed that last part about latex tags being needed…

Hmm…

hrm…

@zerth: you have to tell it what packages to use or it cannot render graphics.

Hmmm. I just looked at my post. The latexpage order apparently didn’t work. Do I need to do a slash-close order at the end?

I fixed the Euler equation so that it would display correctly. We seem to be having a problem with latexpage in the comments. In the meantime, you can wrap your equations in the [latex] and [/latex] tags and it will render correctly.

whoa!

Okie, try again.

gah, stupid shift key. Last try.

For anyone who wants to proof before posting: http://quicklatex.com/

Although you have to put your preamble in under “choose options” and if you mistype your WP tags, it won’t tell you.

Also, I’m pretty sure it’s a plus in the Euler equation.

Harry,

I just checked my hand written notes, and you are correct. I have trouble using keyboards since they haven’t been invented yet.

Regards,

Leonhard

[latex]

\begin{split*}

&\left( \epsilon \frac{d}{d\zeta} – \frac{d^{2}}{d\zeta^{2}} \right) (\bar{T}_{1}(\zeta) +\epsilon \bar{T}_{2}(\zeta) +…)\\

& = \epsilon^{2} \mathfrak{D} ( \bar{T}_{b} – \bar{T}_{1} (\zeta) -\epsilon \bar{T}_{2} (\zeta)+… )exp \left( -\frac{1}{\epsilon ( \bar{T}_{1}(\zeta) + \epsilon\bar{T}_{2}(\zeta)+… ) } \right)

\end{split*}

[\latex]

Yay, part of the assignment I’ve been working on for the last couple of days! Basically trying to write an equation for flame speed and thickness… (hopefully not the only non-EE here)