[SOLVED] List of data.frame's to individual excel worksheets

List of data.frame's to individual excel worksheets - R

I have a list of data.frame's that I would like to output to their own worksheets in excel. I can easily save a single data frame to it's own excel file but I'm not sure how to save multiple data frames to the their own worksheet within the same excel file.

library(xlsx)
write.xlsx(sortedTable[1], "c:/mydata.xlsx")

Solution

Specify sheet name for each list element.

library(xlsx)
file <- paste("usarrests.xlsx", sep = "")
write.xlsx(USArrests, file, sheetName = "Sheet1") 
write.xlsx(USArrests, file, sheetName = "Sheet2", append = TRUE)

Second approach as suggested by @flodel, would be to use addDataFrame. This is more or less an example from the help page of the said function.

file <- paste("usarrests.xlsx", sep="")
wb <- createWorkbook()
sheet1 <- createSheet(wb, sheetName = "Sheet1")
sheet2 <- createSheet(wb, sheetName = "Sheet2")

addDataFrame(USArrests, sheet = sheet1)
addDataFrame(USArrests * 2, sheet = sheet2)
saveWorkbook(wb, file = file)

Assuming you have a list of data.frames and a list of sheet names, you can use them pair-wise.

wb <- createWorkbook()
datas <- list(USArrests, USArrests * 2)
sheetnames <- paste0("Sheet", seq_along(datas)) # or names(datas) if provided
sheets <- lapply(sheetnames, createSheet, wb = wb)
void <- Map(addDataFrame, datas, sheets)
saveWorkbook(wb, file = file)