君到姑苏见，人家尽枕河。
古宫闲地少，水巷小桥多。
夜市卖菱藕，春船载绮罗。
遥知未眠月，乡思在渔歌。
– 杜荀鹤 《送人游吴》

This is going to be a series of visualization with R. The main packages used are ggplot2 and ggvis, and probably shiny. Hadley Wickham sees ggvis as the next generation of ggplot2, it is worth plotting the map by both packages. The first research subject is the China map.

The files (of different format) used for plotting geometry graphics are called ArcGIS files. The 3 key files are of extended name “.shp”, “.dbf” and “.shx”.

Just read an article from Yihui’s blog in which he recommends a lot using library() instead of require() to attach/load a package .

Why ggvis?

ggvis is an awesome data visualization package which builds data graphics with a syntax similar to ggplot2 and creates rich interactive plots like shiny. Since the syntax is very structural, it’s easy to learn and to use.

现在时不时会在Ubuntu系统中编辑文档，将这个系统中的.md编辑完在发回WIN7系统deploy到hexo是一个很烦的过程，尤其是这事儿以后会经常发生的时候。
所以必须寻求一个解决方案，可以在Ubuntu中同样设定一个hexo的文件夹，并通过github同步数据源。

Hexo文件夹并不需要完全同步，涉及到的修改主要涉及Hexo文件夹下的_config.yml, source文件夹和themes文件夹。_config.yml和themes一旦设定，并不需要经常更新，可以在新设备中的Hexo文件夹设定好了以后用老设备中的文件覆盖上去。而source是更新最频繁的，需要将这个文件夹跟github同步。

不了解css,js和swig，重新看了一次主题使用介绍，又大致过了一遍hexo和NexT的基本配置文件，继续对这个hexo博客进行配置。

安装搜狗拼音折腾了很久，安装好了以后，法语和日语键盘死活不能调用出来，也不知道为什么。
想想现在版本下的默认拼音功能已经足够，于是就准备删除搜狗了。

Quoting the introduction on RStudio official site:

R Markdown is an authoring format that enables easy creation of dynamic documents, presentations, and reports from R. It combines the core syntax of markdown (an easy-to-write plain text format) with embedded R code chunks that are run so their output can be included in the final document. R Markdown documents are fully reproducible (they can be automatically regenerated whenever underlying R code or data changes).

We resume the learning note.