R 捕获数据的输出

我想捕获

data

函数的输出，在该函数中，您提供一个包名，该函数生成一个静态输出。我想把它变成一个数据帧

目前，以下给出了静态输出：

data(package = "ggplot2")

我希望它是一个数据帧，实际上从来没有产生过外部静态输出

diamonds                Prices of 50,000 round cut diamonds
economics               US economic time series.
midwest                 Midwest demographics.
movies                  Movie information and user ratings from IMDB.com.
mpg                     Fuel economy data from 1999 and 2008 for 38 popular models of car
msleep                  An updated and expanded version of the mammals sleep dataset.
presidential            Terms of 10 presidents from Eisenhower to Bush W.
seals                   Vector field of seal movements.

---

这足以让你开始吗

> data(package = "ggplot2")$results
     Package   LibPath                  Item          
[1,] "ggplot2" "/home/mrdwab/R/library" "diamonds"    
[2,] "ggplot2" "/home/mrdwab/R/library" "economics"   
[3,] "ggplot2" "/home/mrdwab/R/library" "midwest"     
[4,] "ggplot2" "/home/mrdwab/R/library" "movies"      
[5,] "ggplot2" "/home/mrdwab/R/library" "mpg"         
[6,] "ggplot2" "/home/mrdwab/R/library" "msleep"      
[7,] "ggplot2" "/home/mrdwab/R/library" "presidential"
[8,] "ggplot2" "/home/mrdwab/R/library" "seals"       
     Title                                                              
[1,] "Prices of 50,000 round cut diamonds"                              
[2,] "US economic time series."                                         
[3,] "Midwest demographics."                                            
[4,] "Movie information and user ratings from IMDB.com."                
[5,] "Fuel economy data from 1999 and 2008 for 38 popular models of car"
[6,] "An updated and expanded version of the mammals sleep dataset."    
[7,] "Terms of 10 presidents from Eisenhower to Bush W."                
[8,] "Vector field of seal movements."    

显然，要仅获取“项目”和“标题”数据的

data.frame

，可以使用：

> data.frame(data(package = "ggplot2")$results)[-c(1, 2)]
          Item                                                             Title
1     diamonds                               Prices of 50,000 round cut diamonds
2    economics                                          US economic time series.
3      midwest                                             Midwest demographics.
4       movies                 Movie information and user ratings from IMDB.com.
5          mpg Fuel economy data from 1999 and 2008 for 38 popular models of car
6       msleep     An updated and expanded version of the mammals sleep dataset.
7 presidential                 Terms of 10 presidents from Eisenhower to Bush W.
8        seals                                   Vector field of seal movements.

---

类似于

as.data.frame（data（）[[3]][，3:4]）

？几乎是这样，但这将是一个特定的包。您可能还喜欢这个页面，该页面对一堆pakcages中的R数据集进行编目：如何获取变更点（cpt.mean）的结果及其绘制的（plot（xyz））值？@bjan，我不确定您的评论与这个问题有何关联。。。

cpt.mean

是一个特定包中的函数，您试图提取它的值吗？如果是这样的话，我会从帮助页面开始，看看它是否指定了返回的值的类型（通常在一个名为“value”的部分中）。我已经整理好了，谢谢。