R is a powerful tool for statistics and graphics, but getting started with this language can be frustrating. This short, concise book provides beginners with a selection of how-to recipes to solve simple problems with R. Each solution gives you just what you need to know to use R for basic statistics, graphics, and regression. You'll find recipes on reading data files, creating...
R is a powerful tool for statistics and graphics, but getting started with this language can be frustrating. This short, concise book provides beginners with a selection of how-to recipes to solve simple problems with R. Each solution gives you just what you need to know to use R for basic statistics, graphics, and regression. You'll find recipes on reading data files, creating data frames, computing basic statistics, testing means and correlations, creating a scatter plot, performing simple linear regression, and many more. These solutions were selected from O'Reilly's R Cookbook, which contains more than 200 recipes for R that you'll find useful once you move beyond the basics.
原文摘录
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1，帮助文档
help( functionname)：help(mean) or ?mean
args( functionname)
example( functionname)
2，读文本文件
返回一个data frame
dfrm <- read.table("statisticians.txt", sep=":")
By default, it assumes the data fields are separated by white space (blanks or tabs)
dfrm <- read.table("filename.txt", na.strings=".")：将数据中的NA转化为自定义字符
dfrm <- read.table("statisticians.txt", header=TRUE, stringsAsFactor=FALSE)：定义文件头
在文本文件中的注释：Any line that begins with a pound sign ( #) is ignored
3，读CVS文件
tbl <- read.csv(" filename")
tbl <- read.csv(" filename", header=FALSE)
A good feature of read.csv is that is automatically interprets nonnumeric data as a factor (categorical variable)
tbl <- read.csv("table-data.csv", as.is=TRUE) this indicates that R should not interpret nonnumeric data as a factor
4，vector
Use the c(.... (查看原文)
0 有用 Terry Chen 2011-12-29 23:09:08
太短了，真心是太短了，有空看完整版的 R Cookbook。
0 有用 Y叔 2011-08-17 02:27:05
花了半个下午的时间读完。http://ygc.name/2011/08/17/ggplot2-version-figures-25-recipes-started-r/
0 有用 曲晓峰 2012-06-29 02:03:57
简单直接
0 有用 iphyer 2013-01-08 13:00:49
非常简洁！
0 有用 Seed 2011-11-26 19:28:25
这还真是太初级了，理论上该登杂志的文章居然就变成一本书，翻两页都看完了~