如何解决R 3.6.2版本中‘package ‘ddply’ is not available’安装报错？

Hey there, let's fix this up for you! The error you're seeing happens because there's no standalone R package named ddply—the ddply() function you're looking for is actually part of the plyr package.

Here's how to get it working:

• First, install the plyr package itself using this command:

  install.packages("plyr")
  

  If you run into network issues (like slow downloads), you can specify a domestic CRAN mirror to speed things up (take Tsinghua's mirror as an example):

  install.packages("plyr", repos = "https://mirrors.tuna.tsinghua.edu.cn/CRAN/")
  

• Once the installation finishes, load the plyr package into your R session:

  library(plyr)
  

  Now you can use the ddply() function just like you intended!

A quick note: Your R version 3.6.2 is fully compatible with the plyr package, so version mismatch won't be an issue here.

内容的提问来源于stack exchange，提问作者Jeremy Rios