Cegah nama baris ditulis ke file saat menggunakan write.csv

Perintah:

t <- data.frame(v = 5:1, v2 = 9:5)
write.csv(t, "t.csv")

File yang dihasilkan:

# "","v","v2"
# "1",5,9
# "2",4,8
# "3",3,7
# "4",2,6
# "5",1,5

Bagaimana saya mencegah kolom pertama dengan indeks baris dari ditulis ke file?

write.csv(t, "t.csv", row.names=FALSE)

Dari ?write.csv:

row.names: either a logical value indicating whether the row names of
          ‘x’ are to be written along with ‘x’, or a character vector
          of row names to be written.

Untuk kelengkapan, write_csv()dari readrpaket lebih cepat dan tidak pernah menulis nama baris

# install.packages('readr', dependencies = TRUE)
library(readr)
write_csv(t, "t.csv")

Jika Anda perlu menulis data besar, gunakan fwrite()dari data.tablepaket. Ini jauh lebih cepat daripada keduanya write.csvdanwrite_csv

# install.packages('data.table')
library(data.table)
fwrite(t, "t.csv")

Di bawah ini adalah patok yang diterbitkan Edouard di situsnya

microbenchmark(write.csv(data, "baseR_file.csv", row.names = F),
               write_csv(data, "readr_file.csv"),
               fwrite(data, "datatable_file.csv"),
               times = 10, unit = "s")

## Unit: seconds
##                                              expr        min         lq       mean     median         uq        max neval
##  write.csv(data, "baseR_file.csv", row.names = F) 13.8066424 13.8248250 13.9118324 13.8776993 13.9269675 14.3241311    10
##                 write_csv(data, "readr_file.csv")  3.6742610  3.7999409  3.8572456  3.8690681  3.8991995  4.0637453    10
##                fwrite(data, "datatable_file.csv")  0.3976728  0.4014872  0.4097876  0.4061506  0.4159007  0.4355469    10