RDocumentation: write.xlsx

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if(!require('xlsx')) {
    install.packages('xlsx')
    library('xlsx')
}

# }
file <- paste(tempdir(), "/usarrests.xlsx", sep="")
res <- write.xlsx(USArrests, file)

# to change the default date format
oldOpt <- options()
options(xlsx.date.format="dd MMM, yyyy")
write.xlsx(x, sheet) # where x is a data.frame with a Date column.
options(oldOpt)      # revert back to defaults

# }