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  1. saakje hazenberg
  2. Discussion forum for the 'Online R course' and 'Beginner's Guide to R' book
  3. Wednesday, 06 December 2017
Hi! I am working on exercise 1 in chapter 4 - I could get the tapply function to work fine with mean and SD, but whenever I try to use length, I get the error message

Error in FUN(X[[i]], ...) :
2 arguments passed to 'length' which requires 1

I have tried running it with index "season" in case it was fussy about the level being defined as a factor, but same result.... and I asked a colleague who is good at R to take a look and he didn't figure it out either. Any ideas? Thanks so much! - Saakje
Responses (1)
Alain Accepted Answer Pending Moderation
Saakje...can you post your R code so that I can see what is going on?
Alain
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