use emoji font in R

December 16, 2015 in R, Visualization

![](http://guangchuangyu.github.io/blog_images/2015/Screenshot 2015-12-16 10.55.49.png)

I have played with emoji in R for a while. My solution of using it is different from what implemented in emoGG.

emoGG is a good attemp to add emoji in ggplot2. It render emoji picture (png) and creat a layer, geom_emoji, to add emoji.

In my opinion, emoji should be treated as ordinary font in user interface, albeit it maynot be true internally.

It would be more flexible if we can use emoji as ordinary font and in this way user don’t need to learn extra stuff.

Use ggplot2

May 11, 2014 in Visualization

Why use ggplot2

ggplot2是我见过最human friendly的画图软件，这得益于Leland Wilkinson在他的著作《The Grammar of Graphics》中提出了一套图形语法，把图形元素抽象成可以自由组合的成分，Hadley Wickham把这套想法在R中实现。

为什么要学习ggplot2，可以参考ggplot2: 数据分析与图形艺术的序言（btw: 在序言的最后，我被致谢了）。

Hadley Wickham也给出一堆理由让我们说服自己，我想再补充一点，Hadley Wickham是学医出身的，做为学生物出身的人有什么理由不支持呢:)

draw chinese character Jiong using ggplot2

February 17, 2012 in Visualization, R

The Chinese character Jiong (囧) is now widely used for expressing ideas or feelings such as annoyance, shock, embarrassment, awkwardness, scorn.

The function plot of y=1/(x^2-1) looks very similar of this symbol.

I use ggplot2 to draw the symbol of Jiong.

happy valentine

February 14, 2012 in Visualization

今天看到统计之都上的情人节心形图。这次画的心形函数是： $ x = 16 (sin t)^3$ $ y = 13 cos t - 5 cos 2t - 2 cos 3t - cos 4t$ 尝试用ggplot2来画，结果如下：代码见Github. 类似的心形图以前也是画过的，当然这样的函数图有很多，详见http://www.mathematische-basteleien.de/heart.htm，画起来也很容易。倒是以前画过的蝙蝠侠logo，更有成就感些。

violin plot

February 7, 2012 in Visualization

ggplot2 0.9.0版本将在3月1号发布，改动较大，最近bioc mailing list也有诸多讨论，因为它导致了某些包编译出错（估计是NAMESPACE引起的）。

按照hadley的说法是这是为了把他个人的项目变成一个社区项目。

大多数的改动对用户来说是invisible的，用roxygen2去注释函数，核心代码使用S3重写，分离出一些特性（scales包）等。

最明显的是现在画图速度变快了，不过我觉得最让人兴奋的是guide_legend()和guide_colorbar()两个函数，可以修改legend.

画图的话，加了四个函数geom_map(), geom_raster(),geom_dotplot()和geom_violin().

ggplot2 Version of Figures in <25 Recipes for Getting Started with R>

August 16, 2011 in Visualization, R

In order to provide an option to compare graphs produced by basic internal plot function and ggplot2, I have recreated the figures in the book, 25 Recipes for Getting Started with R, with ggplot2.

The code used to create the images is in separate paragraphs, allowing easy comparison. 1.16 Creating a Scatter Plot