read.csv warning 'EOF within quoted string' prevents complete reading of file

Question

You need to disable quoting.

cit <- read.csv("citations.CSV", quote = "", 
                 row.names = NULL, 
                 stringsAsFactors = FALSE)

str(cit)
## 'data.frame':    112543 obs. of  13 variables:
##  $ row.names    : chr  "10.2307/675394" "10.2307/30007362" "10.2307/4254931" "10.2307/20537934" ...
##  $ id           : chr  "10.2307/675394\t" "10.2307/30007362\t" "10.2307/4254931\t" "10.2307/20537934\t" ...
##  $ doi          : chr  "Archaeological Inference and Inductive Confirmation\t" "Sound and Sense in Cath Almaine\t" "Oak Galls Preserved by the Eruption of Mount Vesuvius in A.D. 79_ and Their Probable Use\t" "The Arts Four Thousand Years Ago\t" ...
##  $ title        : chr  "Bruce D. Smith\t" "Tomás Ó Cathasaigh\t" "Hiram G. Larew\t" "\t" ...
##  $ author       : chr  "American Anthropologist\t" "Ériu\t" "Economic Botany\t" "The Illustrated Magazine of Art\t" ...
##  $ journaltitle : chr  "79\t" "54\t" "41\t" "1\t" ...
##  $ volume       : chr  "3\t" "\t" "1\t" "3\t" ...
##  $ issue        : chr  "1977-09-01T00:00:00Z\t" "2004-01-01T00:00:00Z\t" "1987-01-01T00:00:00Z\t" "1853-01-01T00:00:00Z\t" ...
##  $ pubdate      : chr  "pp. 598-617\t" "pp. 41-47\t" "pp. 33-40\t" "pp. 171-172\t" ...
##  $ pagerange    : chr  "American Anthropological Association\tWiley\t" "Royal Irish Academy\t" "New York Botanical Garden Press\tSpringer\t" "\t" ...
##  $ publisher    : chr  "fla\t" "fla\t" "fla\t" "fla\t" ...
##  $ type         : logi  NA NA NA NA NA NA ...
##  $ reviewed.work: logi  NA NA NA NA NA NA ...

I think is because of this kind of lines (check "Thorn" and "Minus")

 readLines("citations.CSV")[82]
[1] "10.2307/3642839,10.2307/3642839\t,\"Thorn\" and \"Minus\" in Hieroglyphic Luvian Orthography\t,H. Craig Melchert\t,Anatolian Studies\t,38\t,\t,1988-01-01T00:00:00Z\t,pp. 29-42\t,British Institute at Ankara\t,fla\t,\t,"

I'm a new-ish R user and thought I'd post this in case it helps anyone else. I was trying to read in data from a text file (separated with commas) that included a few Spanish characters and it took me forever to figure it out. I knew I needed to use UTF-8 encoding, set the header arg to TRUE, and that I need to set the sep arguemnt to ",", but then I still got hang ups. After reading this post I tried setting the fill arg to TRUE, but then got the same "EOF within quoted string" which I was able to fix in the same manner as above. My successful read.table looks like this:

target <- read.table("target2.txt", fill=TRUE, header=TRUE, quote="", sep=",", encoding="UTF-8")

The result has Spanish language characters and same dims I had originally, so I'm calling it a success! Thanks all!

In the R help section, as pointed out above, just disabling quoting altogether, by simply adding:

    quote = "" 

to the read.csv() worked for me.

The error, "EOF within quoted string", occurred with:

    > iproscan.53A.neg     = read.csv("interproscan.53A.neg.n.csv",
    +                        colClasses=c(pb.id      = "character",
    +                                     genLoc     = "character",
    +                                     icode      = "character",
    +                                     length     = "character",
    +                                     proteinDB  = "character",
    +                                     protein.id = "character",
    +                                     prot.desc  = "character",
    +                                     start      = "character",
    +                                     end        = "character",
    +                                     evalue     = "character",
    +                                     tchar      = "character",
    +                                     date       = "character",
    +                                     ipro.id    = "character",
    +                                     prot.name  = "character",
    +                                     go.cat     = "character",
    +                                     reactome.id= "character"),
    +                                     as.is=T,header=F)
    Warning message:
    In scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,  :
      EOF within quoted string
    > dim(iproscan.53A.neg)
    [1] 69383    16

And the file read in was missing 6,619 lines. But by disabling quoting

    > iproscan.53A.neg     = read.csv("interproscan.53A.neg.n.csv",
    +                        colClasses=c(pb.id      = "character",
    +                                     genLoc     = "character",
    +                                     icode      = "character",
    +                                     length     = "character",
    +                                     proteinDB  = "character",
    +                                     protein.id = "character",
    +                                     prot.desc  = "character",
    +                                     start      = "character",
    +                                     end        = "character",
    +                                     evalue     = "character",
    +                                     tchar      = "character",
    +                                     date       = "character",
    +                                     ipro.id    = "character",
    +                                     prot.name  = "character",
    +                                     go.cat     = "character",
    +                                     reactome.id= "character"),
    +                                     as.is=T,header=F,**quote=""**)    
    > 
    > dim(iproscan.53A.neg)
    [1] 76002    16

Worked without error and all lines were successfully read in.

I also ran into this problem, and was able to work around a similar EOF error using:

read.table("....csv", sep=",", ...)

Notice that the separator parameter is defined within the more general read.table().

Actually, using read.csv() to read a file with text content is not a good idea, disable the quote as set quote="" is only a temporary solution, it only worked with Separate quotation marks. There are other reasons would cause the warning, such as some special characters.

The permanent solution(using read.csv()), finding out what those special characters are and use a regular expression to eliminate them is an idea.

Have you ever think of installing the package {data.table} and use fread() to read the file. it is much faster and would not bother you with this EOF warning. Note that the file it loads it will be stored as a data.table object but not a data.frame object. The class data.table has many good features, but anyway, you can transform it using as.data.frame() if needed.

I too had the similar problem. But in my case, the cause of the issue was due to the presence of apostrophes (i.e. single quotation marks) within some of the text values. This is especially frequent when working with data including texts in French, e.g. «L'autre jour».

So, the solution was simply to adjust the default setting of the quote argument to exclude the «'» symbol, and thus, using quote = "\"" (i.e. double quotation mark only), everything worked fine.

I hope that can help some of you. Cheers.