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2008 Sep 28
2
using tapply on a data frame in a function
...group means in a function. It works outside of a function, but I get the error message from the following code: "Error in tapply(index, cluster, mean) : arguments must have same length." Any suggestions? Thanks. eric d <- data.frame(cbind(cluster=1:2, value1=1:10, value2=11:20)) d FindClusterTraits <- function(framename, index){ MeanCluster <- with(framename, tapply(index, cluster, mean)) return(MeanCluster) } d2 <- FindClusterTraits(d, 'value1') [[alternative HTML version deleted]]