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R会话信息中的星号（*）表示法

[英]Star (*) notation in R session Information

 原文  2019-05-12 06:32:07  5   2    r/ session/ devtools

问题描述

I'm using R's devtools::session_info() to print session information, which gives below output. 我正在使用R的devtools::session_info()打印会话信息，该信息给出以下输出。

在此处输入图片说明

What does star (*) indicate next to the name of library? 库名称旁边的星号（*）表示什么？

2 个解决方案

解决方案1
 2  2019-05-12 06:53:00

From ?devtools::session_info() 来自?devtools::session_info()

*: whether the package is attached to the search path *：包是否附加到搜索路径

You can find the search path by using search() . 您可以使用search()找到搜索路径。 For example for me it shows as 例如对我来说显示为 

search()

# [1] ".GlobalEnv"           "package:janitor"      "package:xts"          "package:zoo"         
# [5] "package:nycflights13" "package:lubridate"    "package:ggrepel"      "package:data.table"  
# [9] "package:matrixStats"  "package:forcats"      "package:stringr"      "package:purrr"       
#[13] "package:readr"        "package:tidyr"        "package:tibble"       "package:ggplot2"     
#[17] "package:tidyverse"    "package:dplyr"        "tools:rstudio"        "package:stats"       
#[21] "package:graphics"     "package:grDevices"    "package:utils"        "package:datasets"    
#[25] "package:methods"      "Autoloads"            "package:base"

To find a function it goes through this list. 要找到一个功能，它会通过此列表。 This might be a good read to understand search path. 这可能是一本好书，有助于您理解搜索路径。

解决方案2
 0  2019-05-12 07:11:16

It seems to mark "other attached packages", as described in sessionInfo , or "*: whether the package is attached to the search path", as the docs formulate it. 好像是在sessionInfo描述的那样，标记为“其他附加程序包”，或者在文档制定时标记为“ *：程序包是否附加到搜索路径”。 For example, session_info returns the following before a call to library(tidyverse) : 例如， session_info在调用library(tidyverse)之前返回以下内容： 

 package     * version date       lib source        
 assertthat    0.2.1   2019-03-21 [1] CRAN (R 3.6.0)
 backports     1.1.4   2019-04-10 [1] CRAN (R 3.6.0)
 callr         3.2.0   2019-03-15 [1] CRAN (R 3.6.0)
 cli           1.1.0   2019-03-19 [1] CRAN (R 3.6.0)
 crayon        1.3.4   2017-09-16 [1] CRAN (R 3.6.0)
 desc          1.2.0   2018-05-01 [1] CRAN (R 3.6.0)
 devtools      2.0.2   2019-04-08 [1] CRAN (R 3.6.0)
 digest        0.6.18  2018-10-10 [1] CRAN (R 3.6.0)
 fs            1.3.0   2019-05-02 [1] CRAN (R 3.6.0)
 glue          1.3.1   2019-03-12 [1] CRAN (R 3.6.0)
 magrittr      1.5     2014-11-22 [1] CRAN (R 3.6.0)
 memoise       1.1.0   2017-04-21 [1] CRAN (R 3.6.0)
 pkgbuild      1.0.3   2019-03-20 [1] CRAN (R 3.6.0)
 pkgload       1.0.2   2018-10-29 [1] CRAN (R 3.6.0)
 prettyunits   1.0.2   2015-07-13 [1] CRAN (R 3.6.0)
 processx      3.3.0   2019-03-10 [1] CRAN (R 3.6.0)
 ps            1.3.0   2018-12-21 [1] CRAN (R 3.6.0)
 R6            2.4.0   2019-02-14 [1] CRAN (R 3.6.0)
 Rcpp          1.0.1   2019-03-17 [1] CRAN (R 3.6.0)
 remotes       2.0.4   2019-04-10 [1] CRAN (R 3.6.0)
 rlang         0.3.4   2019-04-07 [1] CRAN (R 3.6.0)
 rprojroot     1.3-2   2018-01-03 [1] CRAN (R 3.6.0)
 rstudioapi    0.10    2019-03-19 [1] CRAN (R 3.6.0)
 sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 3.6.0)
 usethis       1.5.0   2019-04-07 [1] CRAN (R 3.6.0)
 withr         2.1.2   2018-03-15 [1] CRAN (R 3.6.0)

After calling library(tidyverse) it returns this: 调用library(tidyverse)它返回以下内容： 

 package     * version date       lib source        
 assertthat    0.2.1   2019-03-21 [1] CRAN (R 3.6.0)
 backports     1.1.4   2019-04-10 [1] CRAN (R 3.6.0)
 broom         0.5.2   2019-04-07 [1] CRAN (R 3.6.0)
 callr         3.2.0   2019-03-15 [1] CRAN (R 3.6.0)
 cellranger    1.1.0   2016-07-27 [1] CRAN (R 3.6.0)
 cli           1.1.0   2019-03-19 [1] CRAN (R 3.6.0)
 colorspace    1.4-1   2019-03-18 [1] CRAN (R 3.6.0)
 crayon        1.3.4   2017-09-16 [1] CRAN (R 3.6.0)
 desc          1.2.0   2018-05-01 [1] CRAN (R 3.6.0)
 devtools      2.0.2   2019-04-08 [1] CRAN (R 3.6.0)
 digest        0.6.18  2018-10-10 [1] CRAN (R 3.6.0)
 dplyr       * 0.8.0.1 2019-02-15 [1] CRAN (R 3.6.0)
 forcats     * 0.4.0   2019-02-17 [1] CRAN (R 3.6.0)
 fs            1.3.0   2019-05-02 [1] CRAN (R 3.6.0)
 generics      0.0.2   2018-11-29 [1] CRAN (R 3.6.0)
 ggplot2     * 3.1.1   2019-04-07 [1] CRAN (R 3.6.0)
 glue          1.3.1   2019-03-12 [1] CRAN (R 3.6.0)
 gtable        0.3.0   2019-03-25 [1] CRAN (R 3.6.0)
 haven         2.1.0   2019-02-19 [1] CRAN (R 3.6.0)
 hms           0.4.2   2018-03-10 [1] CRAN (R 3.6.0)
 httr          1.4.0   2018-12-11 [1] CRAN (R 3.6.0)
 jsonlite      1.6     2018-12-07 [1] CRAN (R 3.6.0)
 lattice       0.20-38 2018-11-04 [1] CRAN (R 3.6.0)
 lazyeval      0.2.2   2019-03-15 [1] CRAN (R 3.6.0)
 lubridate     1.7.4   2018-04-11 [1] CRAN (R 3.6.0)
 magrittr      1.5     2014-11-22 [1] CRAN (R 3.6.0)
 memoise       1.1.0   2017-04-21 [1] CRAN (R 3.6.0)
 modelr        0.1.4   2019-02-18 [1] CRAN (R 3.6.0)
 munsell       0.5.0   2018-06-12 [1] CRAN (R 3.6.0)
 nlme          3.1-139 2019-04-09 [1] CRAN (R 3.6.0)
 pillar        1.3.1   2018-12-15 [1] CRAN (R 3.6.0)
 pkgbuild      1.0.3   2019-03-20 [1] CRAN (R 3.6.0)
 pkgconfig     2.0.2   2018-08-16 [1] CRAN (R 3.6.0)
 pkgload       1.0.2   2018-10-29 [1] CRAN (R 3.6.0)
 plyr          1.8.4   2016-06-08 [1] CRAN (R 3.6.0)
 prettyunits   1.0.2   2015-07-13 [1] CRAN (R 3.6.0)
 processx      3.3.0   2019-03-10 [1] CRAN (R 3.6.0)
 ps            1.3.0   2018-12-21 [1] CRAN (R 3.6.0)
 purrr       * 0.3.2   2019-03-15 [1] CRAN (R 3.6.0)
 R6            2.4.0   2019-02-14 [1] CRAN (R 3.6.0)
 Rcpp          1.0.1   2019-03-17 [1] CRAN (R 3.6.0)
 readr       * 1.3.1   2018-12-21 [1] CRAN (R 3.6.0)
 readxl        1.3.1   2019-03-13 [1] CRAN (R 3.6.0)
 remotes       2.0.4   2019-04-10 [1] CRAN (R 3.6.0)
 rlang         0.3.4   2019-04-07 [1] CRAN (R 3.6.0)
 rprojroot     1.3-2   2018-01-03 [1] CRAN (R 3.6.0)
 rstudioapi    0.10    2019-03-19 [1] CRAN (R 3.6.0)
 rvest         0.3.3   2019-04-11 [1] CRAN (R 3.6.0)
 scales        1.0.0   2018-08-09 [1] CRAN (R 3.6.0)
 sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 3.6.0)
 stringi       1.4.3   2019-03-12 [1] CRAN (R 3.6.0)
 stringr     * 1.4.0   2019-02-10 [1] CRAN (R 3.6.0)
 tibble      * 2.1.1   2019-03-16 [1] CRAN (R 3.6.0)
 tidyr       * 0.8.3   2019-03-01 [1] CRAN (R 3.6.0)
 tidyselect    0.2.5   2018-10-11 [1] CRAN (R 3.6.0)
 tidyverse   * 1.2.1   2017-11-14 [1] CRAN (R 3.6.0)
 usethis       1.5.0   2019-04-07 [1] CRAN (R 3.6.0)
 withr         2.1.2   2018-03-15 [1] CRAN (R 3.6.0)
 xml2          1.2.0   2018-01-24 [1] CRAN (R 3.6.0)

If you convert the session_info object into a regular dataframe, you'll see that the asterisks correspond to a logical vector attached : 如果将session_info对象转换为常规数据帧，则会看到星号对应于attached的逻辑矢量： 

si <- devtools::session_info()
as.data.frame(si$packages) %>% select(package, attached)

#### OUTPUT ####

                package attached
assertthat   assertthat    FALSE
backports     backports    FALSE
broom             broom    FALSE
callr             callr    FALSE
cellranger   cellranger    FALSE
cli                 cli    FALSE
colorspace   colorspace    FALSE
crayon           crayon    FALSE
desc               desc    FALSE
devtools       devtools    FALSE
digest           digest    FALSE
dplyr             dplyr     TRUE
fansi             fansi    FALSE
forcats         forcats     TRUE
fs                   fs    FALSE
generics       generics    FALSE
ggplot2         ggplot2     TRUE
glue               glue    FALSE
gtable           gtable    FALSE
haven             haven    FALSE
hms                 hms    FALSE
httr               httr    FALSE
jsonlite       jsonlite    FALSE
lattice         lattice    FALSE
lazyeval       lazyeval    FALSE
lubridate     lubridate    FALSE
magrittr       magrittr    FALSE
memoise         memoise    FALSE
modelr           modelr    FALSE
munsell         munsell    FALSE
nlme               nlme    FALSE
pillar           pillar    FALSE
pkgbuild       pkgbuild    FALSE
pkgconfig     pkgconfig    FALSE
pkgload         pkgload    FALSE
plyr               plyr    FALSE
prettyunits prettyunits    FALSE
processx       processx    FALSE
ps                   ps    FALSE
purrr             purrr     TRUE
R6                   R6    FALSE
Rcpp               Rcpp    FALSE
readr             readr     TRUE
readxl           readxl    FALSE
remotes         remotes    FALSE
rlang             rlang    FALSE
rprojroot     rprojroot    FALSE
rstudioapi   rstudioapi    FALSE
rvest             rvest    FALSE
scales           scales    FALSE
sessioninfo sessioninfo    FALSE
stringi         stringi    FALSE
stringr         stringr     TRUE
tibble           tibble     TRUE
tidyr             tidyr     TRUE
tidyselect   tidyselect    FALSE
tidyverse     tidyverse     TRUE
usethis         usethis    FALSE
utf8               utf8    FALSE
withr             withr    FALSE
xml2               xml2    FALSE

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