How to write data.frame into arff using R

Question

Weka can read csv files, however, if csv file's format is not fully satisfy Arff file standard, it may cause some problem. For example, I found loading a time series CSV file to Weka cause errors repeatedly.

There have been some posts on using python to convert csv to arff online, but I think the code is a little lengthy and not always work.

Is there a safer and quick way to convert csv to arff in R?

Answer 1

Simple, use the package RWeka

library(RWeka)
write.arff(iris, file = "iris.arff")

Answer 2

For Mac User (as RWeka for mac has not fixed yet):

For CSV file which cannot be loaded to Weka using CSVLoader, use R's foreign library to convert dataset from csv file to arff file

The following R code can convert a timeSeries dataset from csv into an arff file accepted by Weka

library(dplyr)
library(lubridate)
library(foreign)  

byd = read.csv('byd_ready.csv')

byd %>% glimpse()

byd = byd %>% mutate(tradeDate = as.Date(tradeDate))

write.arff(byd, file='byd_R1.arff')