在我之前的 R 版本中从未发生过以下情况。
mtcars %>% dplyr::group_by(carb) %>% dplyr::summarise(N=sum(am==1))
Error in summarise_impl(.data, dots, environment(), caller_env()) :
attempt to bind a variable to R_UnboundValue
以下是会话信息：
> sessionInfo()
R version 4.0.0 (2020-04-24)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Red Hat Enterprise Linux
Matrix products: default
BLAS: /usr/lib64/R/lib/libRblas.so
LAPACK: /usr/lib64/R/lib/libRlapack.so
Random number generation:
RNG: Mersenne-Twister
Normal: Inversion
Sample: Rounding
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] DT_0.11 glue_1.3.1 reshape2_1.4.3 DBI_1.1.0 plotly_4.9.1 ggplot2_3.2.1 lubridate_1.7.4 dplyr_0.8.4
[9] shinyjs_1.1 shiny_1.4.0 odbc_1.2.2
loaded via a namespace (and not attached):
[1] tidyselect_1.0.0 purrr_0.3.3 colorspace_1.4-1 vctrs_0.2.2 htmltools_0.4.0 viridisLite_0.3.0 yaml_2.2.1
[8] utf8_1.1.4 blob_1.2.1 rlang_0.4.4 later_1.0.0 pillar_1.4.3 withr_2.1.2 bit64_0.9-7
[15] lifecycle_0.1.0 plyr_1.8.5 stringr_1.4.0 munsell_0.5.0 gtable_0.3.0 htmlwidgets_1.5.1 fastmap_1.0.1
[22] httpuv_1.5.2 crosstalk_1.0.0 fansi_0.4.1 Rcpp_1.0.3 xtable_1.8-4 promises_1.1.0 scales_1.1.0
[29] jsonlite_1.6.1 mime_0.8 bit_1.1-15.1 hms_0.5.3 digest_0.6.23 stringi_1.4.5 grid_4.0.0
[36] cli_2.0.1 tools_4.0.0 magrittr_1.5 lazyeval_0.2.2 tibble_2.1.3 crayon_1.3.4 tidyr_1.0.2
[43] pkgconfig_2.0.3 rsconnect_0.8.16 data.table_1.12.8 assertthat_0.2.1 httr_1.4.1 rstudioapi_0.10 R6_2.4.1
[50] compiler_4.0.0
可能是年纪大的问题dplyr包： 好像是R_UnboundValue已被删除于dplyr 1.0.0因为不是官方 R API 的一部分。
所以尝试更新你的dplyr包裹来自0.8.4 to 1.0.0（或者降低你的 R 等级）。相关 GitHub 公关：https://github.com/tidyverse/dplyr/pull/4592 https://github.com/tidyverse/dplyr/pull/4592
In R 4.0.0与 dplyr1.0.0你的代码似乎工作正常。
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