我正在学习使用 dplyr 并遇到了函数切片。我尝试使用或不使用显式 dplyr 来调用它。
它适用于显式调用，但在没有 dplyr 的情况下调用时会出错。有人可以指导我错误的根源是什么吗？
据我所知，切片函数是 dplyr 独有的，还是也属于其他某个包？
> library("tidyverse")
> sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS 10.14.1
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib
locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
attached base packages:
[1] stats4 parallel stats graphics grDevices utils datasets methods base
other attached packages:
[1] faraway_1.0.7 pd.hg.u95av2_3.12.0 DBI_1.0.0 oligo_1.46.0 oligoClasses_1.44.0
[6] RSQLite_2.1.1 Biostrings_2.50.2 XVector_0.22.0 IRanges_2.16.0 S4Vectors_0.20.1
[11] ArrayExpress_1.42.0 Biobase_2.42.0 BiocGenerics_0.28.0 bindrcpp_0.2.2 forcats_0.3.0
[16] stringr_1.3.1 dplyr_0.7.8 purrr_0.2.5 tidyr_0.8.2 tibble_2.0.0
[21] ggplot2_3.1.0 tidyverse_1.2.1 readr_1.3.1 …