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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
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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
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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
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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
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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
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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
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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
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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
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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
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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