随笔分类 - [31] R
摘要：You should use either indexing or the subset function. For example : R> df <- data.frame(x=1:5, y=2:6, z=3:7, u=4:8) R> df x y z u 1 1 2 3 4 2 2 3 4 5
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摘要：按照某列的值拆分data.frameMy data is like this (for example):ID Rate State1 24 AL2 35 MN3 46 FL4 34 AL5 78 MN6 99 FLI want to split the ...
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摘要：The font AdobePiStd is missing. Affected text will be displayed using a substitute font.缺少字体 AdobePiStd。将使用替换字体显示受影响的文本。. I solved this by copying the...
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摘要：Merging Data Adding Columns To merge two data frames (datasets) horizontally, use the merge function. In most cases, you join two data frames by one o
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摘要：# sorting examples using the mtcars datasetattach(mtcars)# sort by mpgnewdata <- mtcars[order(mpg),]# sort by mpg and cylnewdata <- mtcars[order(mpg,
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摘要：R免费使用；统计工具；# 注释，行注释块注释：anything="这是注释的内容"常用R语言编辑器：Rsutdio，Tinn-R，Eclipse+StatET；中文会有乱码帮助：?,help; ?boxplot, help(boxplot)，help("[[")运行R文件：source('abc.R
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摘要：args_test.R 代码如下：Args <- commandArgs()cat("Args[1]=",Args[1],"\n")cat("Args[2]=",Args[1],"\n")cat("Args[3]=",Args[3],"\n")cat("Args[4]=",Args[4],"\n")
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摘要：df<-NULL new_row<-data.frame(colA="xxx",colB=123) df<-rbind(df,new_row)
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摘要：#==============================# ggplot2: subscript in x-axis labels(ticks) rm(list=ls(all=TRUE))library(ggplot2)data <- data.frame(names=tolow...
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摘要：折线图-ggplot2 http://blog.163.com/yugao1986@126/blog/static/6922850820131161531421/http://blog.sina.com.cn/s/blog_7cffd1400101f50v.html《R Graphics Cookb...
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摘要：在线画韦恩图(Draw venn diagram online)网站: http://jura.wi.mit.edu/bioc/tools/venn.php http://bioinformatics.psb.ugent.be/webtools/Venn/ http://bioinfogp.cnb.
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摘要：注意：R的升级必须先卸载（在R的目录中运行 make uninstall；或运行 yum remove R ）再重新安装（下载/解压/configure/make/make install） Linux （RedHat, CentOS）上升级R语言： sudo yum install R Windo
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摘要：f <- function(start_time) { start_time <- as.POSIXct(start_time) dt <- difftime(Sys.time(), start_time, units="secs") # Since you only want the H:M...
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摘要：Arithmetic OperatorsOperatorDescription+addition-subtraction*multiplication/division^ or ** exponentiationx %% y modulus (x mod y) 5%%2 is 1x %/% y in...
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摘要：cat("the total number is:",3+5,"\n")print(x, ...)?print?cat?format ?write
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摘要：sessionInfo() 查看R中载入的包和版本 writeLines(capture.output(sessionInfo()), "sessionInfo.txt") sink("sessionInfo.txt") sessionInfo() sink() data.frame 动态确定列名称
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摘要：test for data typeis.numeric(), is.character(), is.vector(), is.matrix(), is.data.frame()convert it as.numeric(), as.character(), as.vector(), as.m...
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摘要：Sys.Date( ) returns today's date. 显示当前日期date() returns the current date and time. 显示当前日期和时间# print today's datetoday <-Sys.Date()format(today, format=
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摘要：字符串长度： nchar("hello world") #字符串连接：paste() #paste(..., sep = " ", collapse = NULL)#字符串分割：strsplit() #strsplit(x, split, extended = TRUE, fixed = FALSE
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摘要：numbers <- c(4,23,4,23,5,43,54,56,657,67,67,435, 453,435,324,34,456,56,567,65,34,435)a <- table(numbers)aa[names(a)==435]as.data.frame(table(numbers))...
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