I'm starting with R and I'm trying to load a data frame that I have on my PC.
It's a txt, tab delimited file. I already tested the file by copying and pasting it in Excel, so I know it's properly formatted.
However, when using
myData <- read.table("mydata.txt", header = TRUE, sep = "\t")
myData
All I get is an error message saying
Error: object 'myData' not found
But mydata.txt is located in the same folder where the R file is located at.
Also, notice it's not saying "file not found", if I change the file name to some gibberish like "dsfkad.txt", it will throw an error saying no such file with that name was found.
Furthermore, it seems that the connection with the file gets stuck after you run the command once. If I try to run the command again, all I get in the console is
>
No error output or anything, just the angled bracket.
If I do a change in the code and run it again, it then shows the error
Error in file(file, "rt") : cannot open connection
So it seems like RStudio is not actually closing the file connection after trying to read it and its throwing errors when anything changes, which seems like very abnormal behavior for an IDE.
Related
I am trying to export data in R to a csv file, and as much simple as I try to do it, I always get the same error message. Example:
I create a simple data vector to export
x <- c(1,3,4,3,5,7,5,8,2,5,7)
I try to export with:
write.csv(x,file='whatever.csv')
And I get an error:
error in file(file ifelse (append a w )) cannot open the connection
In addition: Warning message: In file(file, ifelse(append, "a", "w")) :
cannot open file 'whatever.csv': Permission denied
How can I solve this?
First part is to check the working directory and ensure that you have write access to that directory. You can check this with getwd(). I can reproduce your error by trying to write to a directory which is read only.
To set the working directory to something else with read access you can type setwd("H:/foo").
Once you have write access the write.csv(x,file='whatever.csv') should work.
I got the same issue today and I know I have full permission to the folder. What worked for me is giving it the absolute path.
write.csv(data, file="C:/project/file.csv")
If you don't specify a filename (i.e. C:/temp.csv) and just provide a file path, this same error pops up with both write.csv and write_csv.
I got this error today and fixed it by granting everyone write permission to the folder.
Steps: locate the folder on your PC, right-click and select properties, look for the "Security" tab and edit the permission for all to include "Write"
I got this error today because the file I try to rewrite on was open in another program. After I closed it, the problem solved.
Related: I was trying to save a csv to a relative path, that I built incrementally in Windows, but in my case the problem wasn't an error really, but a misunderstanding on my part - in the following code:
library(dplyr)
library(hflights)
path_to_hflights_as_csv <-
file.path(path.expand("~/MyHomeSubDir"),
"hflights.csv")
write.csv(hflights, path_to_hflights_as_csv)
path.expand("~/MyHomeSubDir") is mapped to "C:/Users/my.username/Documents/MyHomeSubDir" instead of "C:/Users/my.username/MyHomeSubDir".
Searching if it was some faulty config while installing R, I found that "home dir" in various Windows versions is indeed "C:/Users/my.username/Documents/" (and not "C:/Users/my.username"):
https://en.wikipedia.org/wiki/Home_directory
https://cran.r-project.org/bin/windows/base/rw-FAQ.html#What-are-HOME-and-working-directories_003f
And when you pass a path including a sub directory that doesn't exist to utils::csv.write the error is similar (only the reason to not opening file is different - cannot open file 'C:/Users/my.username/MyHomeSubDir/hflights.csv': No such file or directory).
I just stumbled across this question in trying to figure it out myself. I had the exact same error message pop up a few times:
Error in file(file, ifelse(append, "a", "w")) :
cannot open the connection
After searching around and finding nothing that worked for me I restarted R and received the same message, but also a new error:
In addition: Warning message:
In file(file, ifelse(append, "a", "w")) :
cannot open file 'censoredpath.file.csv': Permission denied
I went to my file explorer and attempted to open the .csv in Excel and it notified me that it was locked by another user (someone else had the file open on their computer). So if it's not a problem with having access to the directory like what's already been suggested, try opening it in Excel to see if that might be the problem.
In case you tried everything and did not work, check your antivirus. In my case AVAST was causing this issue for some reason.
I am trying to upload a data.frame called 'ftp_test' via ftpUpload command
library(RCurl)
ftpUpload("Localfile.html", "ftp://User:Password#FTPServer/Destination.html")
and am getting an error:
Error in file(what, "rb") : cannot open the connection
In addition: Warning message:
In file(what, "rb") :
cannot open file 'ftp_test': No such file or directory
Could anyone tell me what is the issue here? Can I actually use data.frame and upload from r global environment ?
If I can't use the data.frame is there any workaround?
Many thanks,
Artur
You problem is, that you are trying to send an R object with an file transfer protocol. Since you are saving it there, you have to tell how to save it. A workaround is to save it as a file, upload it and then delete it on your local afterwards. Also saving as R.History is fine, but you need to transfer the R object to a file in some way. This example is used with an open ftp sever (uploads get deleted immediately, but you can try if it works)
filename="test.csv"
write.csv(df, file=filename)
#use your path to the csv file here instead of ".~/test.csv", you can check with getwd()
ftpUpload("~/test.csv", paste("ftp://speedtest.tele2.net/upload/",filename, sep=""))
file.remove(filename)
Also make sure your server is running. You can try your code with the open ftp server.
I have some trouble to open Rdata files on Rstudio.
I tried different directory.
I tried the load() function.
I set up the file pathway with setwd().
I made sure that the file pathway did not contain spaces or accent or particular character in it.
I tried the function load(file.choose()).
The file is 8.4 Mb (so not empty).
But it keeps saying:
"Object is not found"
It is downloaded from the internet but when I try load(url()) it says:
"cannot open the connection", however I do have internet connection.
It also says "status was 'Couldn't connect to server' ".
Any thoughts ?
Any ideas to solve the problem would be greatly appreciated.
Try using the full path to locate the file.
Locate the file on your computer. Let's assume the location is C:/Downloads/thedata.RData
Check if R sees that this file exists file.exists("C:/Downloads/thedata.RData")
If this returns TRUE then the file is there. Try loading load("C:/Downloads/thedata.RData")
Otherwise if file.exists() is FALSE then the file was not reachable. Try moving it to another place and try again
The error you get is Object not found. This error message doesn't seem to be used within the load() function. It can occur if the file-path is missing the surrounding quotes.
Maybe you forgot to quote the filename?
> load(myfile.RData)
Error in load(myfile.RData) : object 'myfile.RData' not found
> load("myfile.RData")
# Works without error.
I just downloaded R onto my computer, but when I try to read a .csv file I get the following error:
Error in file(file, "rt") : cannot open the connection
In addition: Warning message:
In file(file, "rt") :
cannot open file '[filename].csv': No such file or directory
This happens both when I command the program to read the .csv or when I try to import it manually (although that error code is slightly different).
Could this be because I don't have Microsoft Office (and subsequently, Excel) on my computer? The .csv file exists and is not corrupt because I have no problem uploading the file to Google sheets and displaying the data there. Either that, or I didn't install R correctly. Any suggestions?
No, you don't need any special packages to read plain text CSV files in R.
Looking at your error message:
Warning message: In file(file, "rt") : cannot open file '[filename].csv': No such file or directory
I would guess that the problem is your path to the file in question. As a quick fix, you can try using the fully qualified path to your file. For example, on Windows you might try this:
data <- read.csv(file="c:/path/to/filename.csv", header=TRUE, sep=",")
If this works, then the issue was the location of your CSV file. Then, if you want to continue using a relative path, you'll have to figure out what that would be given your current R setup.
I have a xlsx file and to read from Rstudio i saved it as .csv file. Now when i try to read the file from Rstudio, receiving the below error.
setwd("D:/DATA SCIENCE/CCPP-Linear regression")
ccpp<- read.csv("Folds5x2_pp.csv", header = TRUE)
Error in file(file, "rt") : cannot open the connection In addition:
Warning message: In file(file, "rt") : cannot open file
'Folds5x2_pp.csv': No such file or directory
As already mentioned in the comments, the "cannot open the connection" part of the error message confirms that where R is looking is not where the file is.
A few things to keep in mind
use getwd() to see the current R working directory
use setwd() to change R's wd
You should use RStudio projects to organize your projects - this helps with the working directory thing
spaces in paths are difficult sometimes. Looks like you have "D:/DATA SCIENCE", that space can cause problems (you may need to escape the space like "DATA\ SCIENCE".
You can read the file using the full path (e.g. read.csv("D:/DATA SCIENCE/path/file.csv")) or if you are doing this a lot, set a variable to your path data_path ="D:/DATA SCIENCE/path/" and then read.csv(file.path(data_path, "file.csv")) where file.path concatenates with your OS specific path delimiter.
You can import files into RStudio using the Import Dataset option under Tools in the menu bar.