摘要： 1. Introduction In C# there is a technology called LINQ(Language-Integrated Query). It is a set of language level keywords and functions that create q 阅读全文

摘要： 1. How can we begin to use string in C? 1.1 String, Yes and No There are no type string in C language. But in C we use an array of characters end with 阅读全文

摘要： 1. The Problem Recently I came across a project that my colleagues heavily rely themself on excel. Normally that is not a problem and I do think excel 阅读全文

摘要： 1. The Problem I have a dataset and I will do many summaries base on different columns. These summaries have basically the same calculation process. H 阅读全文

摘要： 1. What is tee pipe Tee pipe is an optional pipe tool from package magrittr. It solves a kind of problems that some manipulations, like plotting, prin 阅读全文

摘要： 1. Introduction ggplot is one of the most famous library in R and I use it very ofen in daily workflow. But there are three topics I seldomly touch be 阅读全文

摘要： 1. Introduction I have a R program reads and revises data with dplyr::mutate(). Normally this will not be a problem. But my data frame is very large a 阅读全文

摘要： 1. Introduction In some situations, we will want to sort non-numeric data. This process may help us understand how different level is changing, or hel 阅读全文

摘要： 1. Introduction In this article we will use classic dataset "tips.csv" as example. import pandas as pd import numpy as np tips = pd.read_csv("tips.csv 阅读全文

摘要： 1. Introduction I am surprised there are some high level functions shipped with R base, like download.file(). However, I am even more surprised there 阅读全文