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RSS订阅转载 R语言swirl教程（Regression Models）1——Introduction
R语言swirl教程（Regression Models）1——Introduction| Introduction to Regression Models. (Slides for this and other Data Science courses may be found at github https://github.com/DataScienceSpecialization/courses if you want to use them. They must be downloaded a
2020-06-16 23:46:54
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转载 R语言swirl教程（R Programming）15——Base Graphics
R语言swirl教程15——Base Graphics| One of the greatest strengths of R, relative to other programming languages, is the ease with which we can create publication-quality graphics. In this lesson, you’ll learn about base graphics in R.| We do not cover the more
2020-06-16 23:01:03
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转载 R语言swirl教程（R Programming）14——Dates and Times
R语言swirl教程14——Dates and Times| R has a special way of representing dates and times, which can be helpful if you’re working with data that show how something changes over time (i.e. time-series data) or if your data contain some other temporal information,
2020-06-16 22:31:16
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转载 R语言swirl教程（R Programming）13——Simulation
R语言swirl教程13——Simulation| One of the great advantages of using a statistical programming language like R is its vast collection of tools for simulating random numbers.| This lesson assumes familiarity with a few common probability distributions, but thes
2020-06-16 21:54:43
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转载 R语言swirl教程（R Programming）12——Looking at Data
R语言swirl教程12——Looking at Data| Whenever you’re working with a new dataset, the first thing you should do is look at it! What is the format of the data? What are the dimensions? What are the variable names? How are the variables stored? Are there missing d
2020-06-16 20:47:42
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转载 R语言swirl教程（R Programming）11——vapply and tapply
R语言swirl教程11——vapply and tapply| In the last lesson, you learned about the two most fundamental members of R’s *apply family of functions: lapply() and sapply(). Both take a list as input, apply a function to each element of the list, then combine and ret
2020-06-16 19:50:26
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转载 R语言swirl教程（R Programming）10——lapply and sapply
R语言swirl教程10——lapply and sapply| In this lesson, you’ll learn how to use lapply() and sapply(), the two most important members of R’s *apply family of functions, also known as loop functions.| These powerful functions, along with their close relatives (v
2020-06-16 16:46:22
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转载 R语言swirl教程（R Programming）9——Function
R语言swirl教程9——Function| Functions are one of the fundamental building blocks of the R language. They are small pieces of reusable code that can be treated like any other R object.| If you’ve worked through any other part of this course, you’ve probably us
2020-06-16 14:58:35
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转载 R语言swirl教程（R Programming）8——Logic
R语言swirl教程8——Logic| This lesson is meant to be a short introduction to logical operations in R.| There are two logical values in R, also called boolean values. They are TRUE and FALSE. In R you can construct logical expressions which will evaluate to eit
2020-06-16 00:05:23
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转载 R语言swirl教程（R Programming）7——Matrices and Data Frames
R语言swirl教程7——Matrices and Data Frames| In this lesson, we’ll cover matrices and data frames. Both represent ‘rectangular’ data types, meaning that they are used to store tabular data, with rows and columns.| The main difference, as you’ll see, is that ma
2020-06-15 23:25:05
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转载 R语言swirl教程（R Programming）6——Subsetting Vectors
R语言swirl教程6——Subsetting Vectors| In this lesson, we’ll see how to extract elements from a vector based on some conditions that we specify.| For example, we may only be interested in the first 20 elements of a vector, or only the elements that are not NA,
2020-06-15 22:23:40
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转载 R语言swirl教程（R Programming）5——Missing Values
R语言swirl教程5——Missing Values| Missing values play an important role in statistics and data analysis. Often, missing values must not be ignored, but rather they should be carefully studied to see if there’s an underlying pattern or cause for their missingne
2020-06-15 21:21:15
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转载 R语言swirl教程（R Programming）4——Vectors
Vectors| The simplest and most common data structure in R is the vector.…|=== | 3%| Vectors come in two different flavors: atomic vectors and lists. An a
2020-06-15 01:41:19
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转载 R语言swirl教程（R Programming）3——Sequences of Numbers
swirl 3：Sequences of Numbers| In this lesson, you’ll learn how to create sequences of numbers in R.…|===== | 4%| The simplest way
2020-06-13 23:34:28
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翻译 R语言swirl教程（R Programming）2——Workspace and Files
R语言swirl教程2——Workspace and Files在本课中，您将学习如何在R中检查本地工作空间，并开始探索您的工作空间和机器文件系统之间的关系。因为不同的操作系统对于文件路径和输出有不同协定，这些命令可能因机器而异。但R提供了用于与文件交互的通用API(一组通用命令)，这样你的代码就能在不同类型的计算机上工作了。让我们直接开始，这样您就可以对这些特殊的功能如何工作有一个感觉！使用getwd()确定R使用哪个目录作为当前工作目录。getwd ()[1] “C:/Users/bj/
2020-06-13 22:29:50
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翻译 R语言swirl教程（R Programming）1——Basic Building Blocks
R语言swirl教程——Basic Building Blocks| In this lesson, we will explore some basic building blocks of the R programming language.... |== | 3%| If at any point you'd
2020-06-13 17:22:53
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一维二维扩散模型Matlab代码
2018-10-25
WASP水质模型有毒物质用例
2018-08-28
WASP水质模型稳态示例数据等
2018-08-28
WASP Model 流域例子, 包含用于将 LSPC 链接到WASP水质模型的用例文件
2018-08-28
Qual2K是一个综合性河流水质模型，一维稳态模型
2018-08-22
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