could not find function "cast" despite reshape2 installed and loaded

18
votes

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"
2
rreshape2
Could you post your sessionInfo()? – Luciano Selzer
> sessioninfo() Error: could not find function "sessioninfo" – Jack Frost
Not that you need to run it here, but that has to be sessionInfo() (not sessioninfo()). – Josh O'Brien

2 Answers

24
votes

In reshape2, cast() has been replaced by two functions: acast() and dcast().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.

2
votes

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