---
title:  "Advanced examples"
mathjax: true
layout: post
categories: media
---

![Swiss Alps](https://user-images.githubusercontent.com/4943215/55412536-edbba180-5567-11e9-9c70-6d33bca3f8ed.jpg)


## MathJax

You can enable MathJax by setting `mathjax: true` on a page or globally in the `_config.yml`. Some examples:

[Euler's formula](https://en.wikipedia.org/wiki/Euler%27s_formula) relates the  complex exponential function to the trigonometric functions.

$$ e^{i\theta}=\cos(\theta)+i\sin(\theta) $$

The [Euler-Lagrange](https://en.wikipedia.org/wiki/Lagrangian_mechanics) differential equation is the fundamental equation of calculus of variations.

$$ \frac{\mathrm{d}}{\mathrm{d}t} \left ( \frac{\partial L}{\partial \dot{q}} \right ) = \frac{\partial L}{\partial q} $$

The [Schrödinger equation](https://en.wikipedia.org/wiki/Schr%C3%B6dinger_equation) describes how the quantum state of a quantum system changes with time.

$$ i\hbar\frac{\partial}{\partial t} \Psi(\mathbf{r},t) = \left [ \frac{-\hbar^2}{2\mu}\nabla^2 + V(\mathbf{r},t)\right ] \Psi(\mathbf{r},t) $$

## Code

Embed code by putting `{{ "{% highlight language " }}%}` `{{ "{% endhighlight " }}%}` blocks around it. Adding the parameter `linenos` will show source lines besides the code.

{% highlight c %}

static void asyncEnabled(Dict* args, void* vAdmin, String* txid, struct Allocator* requestAlloc)
{
    struct Admin* admin = Identity_check((struct Admin*) vAdmin);
    int64_t enabled = admin->asyncEnabled;
    Dict d = Dict_CONST(String_CONST("asyncEnabled"), Int_OBJ(enabled), NULL);
    Admin_sendMessage(&d, txid, admin);
}

{% endhighlight %}

## Gists

With the `jekyll-gist` plugin, which is preinstalled on Github Pages, you can embed gists simply by using the `gist` command:

<script src="https://gist.github.com/5555251.js?file=gist.md"></script>

## Images

Upload an image to the *assets* folder and embed it with `![title](/assets/name.jpg))`. Keep in mind that the path needs to be adjusted if Jekyll is run inside a subfolder.

A wrapper `div` with the class `large` can be used to increase the width of an image or iframe.

![Flower](https://user-images.githubusercontent.com/4943215/55412447-bcdb6c80-5567-11e9-8d12-b1e35fd5e50c.jpg)

[Flower](https://unsplash.com/photos/iGrsa9rL11o) by Tj Holowaychuk

## Embedded content

You can also embed a lot of stuff, for example from YouTube, using the `embed.html` include.

{% include embed.html url="https://www.youtube.com/embed/_C0A5zX-iqM" %}