问题
In following Hadley Wickham's "Practical tools for exploring data and models" examples in section 2.4, Casting molten data I'm getting Error: could not find function "cast". I have the reshape2 package installed and loaded.
> cast(msmithsm, time + subject ~ variable)
Error: could not find function "cast"
回答1:
In reshape2, cast() has been replaced by two functions: acast() and dcast().
From ?cast, in package reshape2:
Description:
Use ‘acast’ or ‘dcast’ depending on whether you want vector/matrix/array output or data frame output.
回答2:
Had related issue (Error: could not find function "dcast"). I had old library, library(plyr), so just added to code...
install.packages("reshape2") # may already be installed
library(reshape2)
Then dcast worked again
来源：https://stackoverflow.com/questions/12468843/could-not-find-function-cast-despite-reshape2-installed-and-loaded