R：运行 purrr 包中 reduce() 的示例代码时出错

Question

I'm looking to use reduce() to concatenate a variable number of columns from a data frame pairwise. It looked like reduce() would do the job, so I tried some of the example code and got this error. I'm using RStudio, Version 1.0.136

> require(tidyverse)

> x <- list(c(0, 1), c(2, 3), c(4, 5))
> x %>% reduce(c)
# Error: `x` must be a vector (not a NULL) 
> sessionInfo()
# R version 3.3.2 (2016-10-31)
# Platform: x86_64-apple-darwin13.4.0 (64-bit)
# Running under: OS X El Capitan 10.11.6

# locale:
# [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

# attached base packages:
# [1] stats     graphics  grDevices utils     datasets  methods   base     

# other attached packages:
# [1] dplyr_0.5.0     purrr_0.2.2     readr_1.0.0     tidyr_0.6.1     tibble_1.2      ggplot2_2.2.1  
# [7] tidyverse_1.1.1

# loaded via a namespace (and not attached):
 # [1] Rcpp_0.12.9      xml2_1.1.1       magrittr_1.5     hms_0.3          rvest_0.3.2      mnormt_1.5-5    
 # [7] munsell_0.4.3    colorspace_1.3-2 lattice_0.20-34  R6_2.2.0         httr_1.2.1       stringr_1.1.0   
# [13] plyr_1.8.4       tools_3.3.2      parallel_3.3.2   grid_3.3.2       broom_0.4.1      nlme_3.1-130    
# [19] gtable_0.2.0     psych_1.6.12     DBI_0.5-1        modelr_0.1.0     readxl_0.1.1     lazyeval_0.2.0  
# [25] assertthat_0.1   reshape2_1.4.2   haven_1.0.0      stringi_1.1.2    forcats_0.2.0    scales_0.4.1    
# [31] lubridate_1.6.0  jsonlite_1.2     foreign_0.8-67  

PS This is my first question, so I tried to err on the side of too much info. Let me know if I need to provide different/more/less information.

Answer 1

As said in comments there was a variable named c that masked the function c .

Don't ever name anything c , except maybe list elements or column names.