R random forest : data (x) has 0 rows -


i using randomforest function randomforest package find important variable: dataframe called urban , response variable revenue numeric.

urban.random.forest <- randomforest(revenue ~ .,y=urban$revenue, data = urban, ntree=500,    keep.forest=false,importance=true,na.action = na.omit)

i following error: 

error in randomforest.default(m, y, ...) : data (x) has 0 rows

on source code related x variable:

n <- nrow(x) p <- ncol(x) if (n == 0)  stop("data (x) has 0 rows")

but cannot understand x.

i solved that. had columns values na or same. dropped them , went ok. columns classes character, numeric , factor.

 candidatesnodata.index <- c()  (j in (1 : ncol(dataframe)))   {     if (    is.numeric(dataframe[ ,j])  &  length(unique(as.numeric(dataframe[ ,j]))) == 1      )      {candidatesnodata.index <- append(candidatesnodata.index,j)}                                 }  dataframe <- dataframe[ , - candidatesnodata.index]

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