4.获取帮助

> help.start()
如果什么都不发生的话，你应该自己打开‘http://127.0.0.1:22431/doc/html/index.html’
Making 'packages.html' ... done
> help(sum) #加载sum函数的帮助信息
> ?plot #查看plot函数的帮助信息
> args(plot) #只查看plot函数的参数
function (x, y, ...) 
NULL
>example(mean) #查看mean函数（普通函数）的写法示例
> example("hist")#查看hist函数（绘图函数）的绘图示例

hist> op <- par(mfrow = c(2, 2))

hist> hist(islands)
按<Return>键来看下一个图: 
Error in plot.new() : figure margins too large
> demo (graphics) #查看案例图
> help("package=ggplot2")#查看ggplot2的帮助文档
> vignetee() #更为规整的帮助信息 ：包含开发者等信息
> vignetee("xts") #查看xts打开帮助文档
>??plot #不用先加载包就能直接查看帮助信息，（？plot是在加载完包的前提下使用的）
> help.search("heatmap") #搜索画热图的函数
> ??heatmap  #同上
> apropos("sum") #列出包含所有关键字的内容
 [1] ".colSums"                ".rowSums"               
 [3] ".rs.callSummary"         ".rs.summarizeDir"       
 [5] ".rs.tutorial.onResume"   ".tryResumeInterrupt"    
 [7] "colSums"                 "contr.sum"              
 [9] "cumsum"                  "format.summaryDefault"  
[11] "marginSums"              "print.summary.table"    
[13] "print.summary.warnings"  "print.summaryDefault"   
[15] "rowsum"                  "rowsum.data.frame"      
[17] "rowsum.default"          "rowSums"                
[19] "sum"                     "summary"                
[21] "Summary"                 "summary.aov"            
[23] "summary.connection"      "summary.data.frame"     
[25] "Summary.data.frame"      "summary.Date"           
[27] "Summary.Date"            "summary.default"        
[29] "Summary.difftime"        "summary.factor"         
[31] "Summary.factor"          "summary.glm"            
[33] "summary.lm"              "summary.manova"         
[35] "summary.matrix"          "Summary.numeric_version"
[37] "Summary.ordered"         "summary.POSIXct"        
[39] "Summary.POSIXct"         "summary.POSIXlt"        
[41] "Summary.POSIXlt"         "summary.proc_time"      
[43] "summary.srcfile"         "summary.srcref"         
[45] "summary.stepfun"         "summary.table"          
[47] "summary.warnings"        "summaryRprof"           
> apropos("sum",mod="function")#限制列出的内容，比如列出关键字为sum的所有函数
 [1] ".colSums"                ".rowSums"               
 [3] ".rs.callSummary"         ".rs.summarizeDir"       
 [5] ".rs.tutorial.onResume"   ".tryResumeInterrupt"    
 [7] "colSums"                 "contr.sum"              
 [9] "cumsum"                  "format.summaryDefault"  
[11] "marginSums"              "print.summary.table"    
[13] "print.summary.warnings"  "print.summaryDefault"   
[15] "rowsum"                  "rowsum.data.frame"      
[17] "rowsum.default"          "rowSums"                
[19] "sum"                     "summary"                
[21] "Summary"                 "summary.aov"            
[23] "summary.connection"      "summary.data.frame"     
[25] "Summary.data.frame"      "summary.Date"           
[27] "Summary.Date"            "summary.default"        
[29] "Summary.difftime"        "summary.factor"         
[31] "Summary.factor"          "summary.glm"            
[33] "summary.lm"              "summary.manova"         
[35] "summary.matrix"          "Summary.numeric_version"
[37] "Summary.ordered"         "summary.POSIXct"        
[39] "Summary.POSIXct"         "summary.POSIXlt"        
[41] "Summary.POSIXlt"         "summary.proc_time"      
[43] "summary.srcfile"         "summary.srcref"         
[45] "summary.stepfun"         "summary.table"          
[47] "summary.warnings"        "summaryRprof"     
> RSiteSearch("matlab")  #使用网页进行搜索，并使用默认浏览器进行打开访问官网
檢索查詢疑問已被提交给http://search.r-project.org
计算结果应很快就在瀏覽器里打开

在google中搜索rseek.org ：可以看到所有于R相关的内容