(Excel xlsx Multiple Columns) Write,Read,Change,Write

require(gdata)
require(xlsx)

n = c(2, 3, 5)
s = c("aa", "bb", "cc")
b = c(TRUE, FALSE, TRUE)
df = data.frame(n, s, b)       # df is a data frame

write.xlsx(df, "file3.xlsx")



#read file and make changes

mydata = read.xls("file3.xlsx")
mydata[2,2] <- mydata[2,2]+1 #in column n (with 2, 3, 5 as values) we will increase the value of 3
write.xlsx(df, "file3.xlsx", row.names=FALSE)