Quickly remove zero variance variables from a data.frame

Question

I have a large data.frame that was generated by a process outside my control, which may or may not contain variables with zero variance (i.e. all the observations are the sa

Answer 1

Use the Caret Package and the function nearZeroVar

require(caret)
NZV<- nearZeroVar(dataset, saveMetrics = TRUE)
NZV[NZV[,"zeroVar"] > 0, ] 
NZV[NZV[,"zeroVar"] + NZV[,"nzv"] > 0, ]