write.csv 只需调用 write.table 所以你可以通过3次调用 write.table 来实现你想要的。

  write.table（df1，filename.csv，col.names = TRUE，sep =，）
 write.table（df2，filename.csv，col.names = FALSE，sep = ，，append = TRUE）
 write.table（df3，filename.csv，col.names = FALSE，sep =，，append = TRUE）
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实际上，你可以通过将你的数据帧与rbind组合成一个df，然后调用write.csv一次来避免整个问题。
  write.csv（rbind（df1，d32，df3），filename.csv）
 
 
I have 3 data frame, and I want them to be written in one single .csv file, one above the others, not in a same table. So, 3 different tables in one csv file. They all have same size. 

The problem with write.csv: it does not contain "append" feature

The problem with write.table:  csv files from write.table are not read prettily by Excel 2010 like those from write.csv





Post I already read and in which I could not find solution to my problem :

• write.csv() a list of unequally sized data.frames
• Creating a file with more than one data frame

Solution ?

write.csv just calls write.table under the hood, with appropriate arguments. So you can achieve what you want with 3 calls to write.table.

write.table(df1, "filename.csv", col.names=TRUE, sep=",")
write.table(df2, "filename.csv", col.names=FALSE, sep=",", append=TRUE)
write.table(df3, "filename.csv", col.names=FALSE, sep=",", append=TRUE)

Actually, you could avoid the whole issue by combining your data frames into a single df with rbind, then calling write.csv once.

write.csv(rbind(df1, d32, df3), "filename.csv")