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Zhen Zhang's Blog

Functional Programming Introduction

Posted on 2015-10-22
These days I read the “Advanced R” Book written by Hadley Wickham. I choose this book since I think I have mastered most of R’s intermediate commands, ...
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Zhen Zhang's Blog

Neural Network Algorithm

Posted on 2015-10-16
After logistic regression, it is time to move on the Neural Network Algorithm since we also need to use gradient descent here. So I will first introdu ...
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Zhen Zhang's Blog

Logistic Regression

Posted on 2015-10-10
Logistic is one of the most useful regression algorithm, and in this post, I will talk about the algorithm, its optimization method, its implementatio ...
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Zhen Zhang's Blog

Some thoughts on PLA algorithm

Posted on 2015-09-28
PLA (Perceptron Learning Algorithm) is a very basic machine learning algorithm. It serves as an approach to separate two class of staffs. In this post ...
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Zhen Zhang's Blog

R map part 3 -- ggmap

Posted on 2015-09-17
Now here we will discuss a more fantastic package: ggmap. ggmap is a map implementation of ggplot. With this tool, we can use google map through its A ...
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Zhen Zhang's Blog

R map part 2 -- ggplot

Posted on 2015-09-16
ggplot can draw the map in a more decent way. But the data ggplot deal with will not be our original data. Instead, it will first transform the data u ...
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Zhen Zhang's Blog

R map part 1 -- introduction

Posted on 2015-09-14
It is very common for us to visualize our results using a map. We can put the data into the map to illuminate the audiences. In this post, I will talk ...
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Zhen Zhang's Blog

Mac上R作图中文字体的处理

Posted on 2015-08-18
这几天在学习R绘制中国地图以供数据分析之用,然而Mac上R作图的默认设备是Quartz,如果不进行中文字体的设置,是无法出现中文汉字的,会出现诸如框框的情况。为此,我查询了一些资料,主要参考两篇文章,讲了如何进行字体的设置。我把他们列在了最后的参考文献中。 Mac上字体的查看Mac上安装了一些中文字 ...
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Zhen Zhang's Blog

Shiny Introduction Summary

Posted on 2015-08-16
Today I learned how to build a simple shiny app using the package of “shiny” developed by RStudio. I must admit that this is a wonderful package which ...
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Zhen Zhang's Blog

VPS 折腾系列(二)-- mail server

Posted on 2015-08-09
这篇教程我们主要来讨论怎么利用VPS来搭建服务器。 (本文主要是对这篇文章进行了一些解释、翻译和拓展,其中一些地方进行了更正,并且加入了一些digitalocean的特色设置,在此声明) 原因我们为什么会有这样一个想法呢?当我们拥有了自己的域名以后,很显然的就会去想,如果我有一个以我的域名命名的邮箱 ...
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Zhen Zhang

Zhen Zhang

學須靜也 才須學也

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