Prevent Row Names to Be Written to File When Using Write.Csv

Prevent row names to be written to file when using write.csv

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

From ?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.

R - write to file without colum 0 (write.csv or write.table)

Just add row.names = FALSE into write.table().

write.csv is messing header names when writing data frame to disk

We need to extract the list elements with [[ as [ is still a list with a single data.frame

for (i in seq_along(data_frames)) {
  file_name<- paste0("data/to_save/",names(data_frames[i]),".csv")
   write.csv(data_frames[[i]], file = file_name, row.names = FALSE, col.names = TRUE)
} 

Read CSV in R, but Keep Character Row Names

You have to be aware that quantmod returns xts-objects. So the first column (the dates) is the index. To write xts-objects to a, say csv-file, the easiest way is to use the write.zoo function.

getSymbols('AAPL',from='2018-01-01’)
write.zoo(AAPL,'aapl.csv',sep=',',quote=FALSE)

quotes=FALSE removes the quotes around the column names.

How to avoid extra column when writing a csv file?

In your write.csv statement use the option row.names=FALSE to suppress the first column - it is on by default.

Write a data frame to csv file without column header in R

Dont use write.csv, use write.table

 write.table( <yourdf>, sep=",",  col.names=FALSE)

You cannot change many settings in write.csv -- the arguments are just there as a reminder to the user. From the documentation:

These wrappers are deliberately inflexible: they are designed to ensure that the correct conventions are used to write a valid file. Attempts to change append, col.names, sep, dec or qmethod are ignored

Write csv with different separators in same df in R

With readr you can use write_delim() to output a file with comma-separated column names then call it a second time, without column names, and in append mode.

library(read)

mtcars[0, ] %>% 
  write_delim(file = "test.dat",delim = ',', col_names = TRUE)

mtcars %>% 
  write_delim(file = "test.dat",delim = ';', col_names = FALSE, append = TRUE)

Row names column can't be removed in R

That's the default functionality of write.table and write.csv. Add row.names=FALSE. From ?write.csv:

Usage:

     write.table(x, file = "", append = FALSE, quote = TRUE, sep = " ",
                 eol = "\n", na = "NA", dec = ".", row.names = TRUE,
                 col.names = TRUE, qmethod = c("escape", "double"),
                 fileEncoding = "")
     
     write.csv(...)
     write.csv2(...)

Arguments:

   ...

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.

Update your for loop as:

for(run in 1:length(splist)) {
  dataList[[run]]<-GetMatrix(dat,splist[run])  
  mapply(write.csv, x=dataList, file=filenameVal[run], row.names=FALSE) # CHANGE
  print(paste(run,splist[run]))
}

Demo with real data:

write.csv(iris[1:3,])
# "","Sepal.Length","Sepal.Width","Petal.Length","Petal.Width","Species"
# "1",5.1,3.5,1.4,0.2,"setosa"
# "2",4.9,3,1.4,0.2,"setosa"
# "3",4.7,3.2,1.3,0.2,"setosa"

write.csv(iris[1:3,], row.names=FALSE)
# "Sepal.Length","Sepal.Width","Petal.Length","Petal.Width","Species"
# 5.1,3.5,1.4,0.2,"setosa"
# 4.9,3,1.4,0.2,"setosa"
# 4.7,3.2,1.3,0.2,"setosa"

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