[R] arguments must have same length

[suntime]

> score<-read.csv("http://users.stat.umn.edu/~chen2285/hw/ACT.csv")

> interaction.plot(sex,rep(1,861),score,fun=mean,legend=F,main="profile of
> sex")
Error: tapply(response, list(x.factor, trace.factor), fun) : 
  arguments must have same length

> length(sex)
[1] 861
> length(type)
[1] 861
> length(score)
[1] 3

How can I alter the length of the variable score here to make this function
work?
or any other way to perform interaction plot? 


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