Dear list,
In my experiments in reading in text data, I have obtained some peculiar
results. I would appreciate any help in understanding these results. Consider
the following code :
## Reading in text data from a text file
### the first line of file f1.txt contains the text :
c:\Rtools\bin;c:\Rtools\perl\bin;c:\Rtools\MinGW\bin;
f1<-file("C:\\Ex\\f1.txt")
c1<-readLines(f1,1)
c2<-gsub(";",";\n",c1)
cat(c2)
close(f1)
####### the above code gives exactly the results that I want
# next, attempt to read the same text in via textConnection
f2<-textConnection("c:\Rtools\bin;c:\Rtools\perl\bin;c:\Rtools\MinGW\bin;")
d1<-readLines(f2)
################
The results that I obtained (with an echo of the commands) were :
> f1<-file("C:\\Ex\\f1.txt")
> c1<-readLines(f1,1)
> c1
[1] "c:\\Rtools\\bin;c:\\Rtools\\perl\\bin;c:\\Rtools\\MinGW\\bin;"
> c2<-gsub(";",";\n",c1)
> cat(c2)
c:\Rtools\bin;
c:\Rtools\perl\bin;
c:\Rtools\MinGW\bin;
> close(f1)
> f2<-textConnection("c:\Rtools\bin;c:\Rtools\perl\bin;c:\Rtools\MinGW\bin;")
Error: '\R' is an unrecognized escape in character string starting "c:\R"
>
What I would like to know :
1. The textConnection command is, from what I understand, usually used to test
typical data in a text file. However, in my example, initial testing with this
command fails while the longer step of reading from a text file succeeds. Is
there any reason for this? Is there any workaround for the problem with the
textConnection command ?
2. There appear to be similiar problem with the read.table command. Using the
allowEscapes =TRUE did not seem to help. Is there some other option here? Like,
for example, temporarily setting another character like "<" as the escape
character?
I would like to explain here that these questions are not directly related to
any real world problem solving. They are just my attempts to understand the R
language better.
Thanking you,
Ravi
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