为什么我在输入“算术”时要参考手册页?mgcv faq`没有'library(mgcv)'?

当我真的犯了一个错误的时候我发现了这个。我想得到手册页 mgcv.FAQ ,但是我

• 忘了做 library(mgcv) ;
• 说错了 ?mgcv-faq .

但是,R奇怪地把我引向doc页面 ?Arithmetic .

怎么回事?在我做了之后 库(mgcv) ,放置 ?mgcv常见问题解答 现在给出一个错误:

#Error in eval(argExpr, envir) : object 'mgcv' not found
#Error in .signatureFromCall(fdef, expr, envir, doEval) : 
#  error in trying to evaluate the expression for argument ‘e1’ (mgcv)

有人能解释这种行为吗?

sessionInfo() 之前 库(mgcv) :

R version 3.4.4 (2018-03-15)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.5 LTS

Matrix products: default
BLAS/LAPACK: /usr/lib/libopenblas.so

locale:
 [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_GB.UTF-8        LC_COLLATE=en_GB.UTF-8    
 [5] LC_MONETARY=en_GB.UTF-8    LC_MESSAGES=en_GB.UTF-8   
 [7] LC_PAPER=en_GB.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_GB.UTF-8 LC_IDENTIFICATION=C      

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

loaded via a namespace (and not attached):
[1] compiler_3.4.4

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

会话信息() 之后 库(mgcv) :

## only shows what is different from the above

other attached packages:
[1] mgcv_1.8-24  nlme_3.1-137

loaded via a namespace (and not attached):
[1] compiler_3.4.4  Matrix_1.2-14   tools_3.4.4     grid_3.4.4     
[5] lattice_0.20-35

我没有Rstudio,所以我在终端运行R。在终端中显示手动页面。