R devel - Dec 2009 - read.csv confused by newline characters in header (PR#14103)

Full_Name: George Russell
Version: 2.10.0
OS: Microsoft Windows XP Service Pack 2
Submission from: (NULL) (217.111.3.131)


The following code (typed into R --vanilla)

testString <- '"B1\nB2"\n1\n'
con <- textConnection(testString)
tab <- read.csv(con,stringsAsFactors = FALSE)

produces a data frame with with one row and one column; the name of the column
is "B1.B2" (alright so far). However according to
print(tab[[1,1]])

the value of the entry in the first row and first column is

"B2\n1\n"

So B2 has somehow got into both the names of the data frame and its entry.
Either R is confused or I am. What is going on?

g.russell at eos-solutions.com wrote:
> Full_Name: George Russell
> Version: 2.10.0
> OS: Microsoft Windows XP Service Pack 2
> Submission from: (NULL) (217.111.3.131)
> 
> 
> The following code (typed into R --vanilla)
> 
> testString <- '"B1\nB2"\n1\n'
> con <- textConnection(testString)
> tab <- read.csv(con,stringsAsFactors = FALSE)
> 
> produces a data frame with with one row and one column; the name of the
column
> is "B1.B2" (alright so far). However according to
> print(tab[[1,1]])
> 
> the value of the entry in the first row and first column is
> 
> "B2\n1\n"
> 
> So B2 has somehow got into both the names of the data frame and its entry.
> Either R is confused or I am. What is going on?
Presumably, read.table is not obeying quotes when removing what it
thinks is the header line. Another variation is this:
> tab <- read.table(stdin(), head=T)
0: "B1
0: B2"
1: 1
2:
> tab
  B1.B2
1   B2"
2     1


It's somehow connected to the

pushBack(c(lines, lines), file)

bits in readtable.R, but I don't quite get it.

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