R system call returning stdin without escape characters
Question
EDIT: This question was poorly thought out. My issue is actually with simply trying to display the text via shiny - not storing it. Somedays you just don't think clearly.
I have a python script that prints some results to stdin that I would like to read into a character vector in R. This generally works great using system(...,intern=TRUE) , however in this case it does not work for me when escape characters are added on (the script returns HTML and adding escape characters can lead to malformed HTML). I can get around this by saving the output from python into a temporary file and reading that file into R, but I'd rather avoid that if there is an easy fix that I can't think of. Here is an example of what I mean:
> #f.py is a text file containing
>
> # #!/usr/bin/python
> #
> # html = """
> # <HTML>
> # <p>some content</p>
> # <p> some more content </p>
> # </HTML>"""
> #
> # print html
>
> #the /t, among other escapes, break the html
> v1 <- paste(system("./f.py",intern=TRUE),collapse="")
> v1
[1] "\t\t<HTML>\t\t\t<p>some content</p>\t\t \t<p> some more content </p>\t\t</HTML>"
>
> #this is what I want... but it needs to be saved into an object
> system("./f.py")
<HTML>
<p>some content</p>
<p> some more content </p>
</HTML>
> #or equivalently
> cat(v1)
<HTML> <p>some content</p> <p> some more content </p> </HTML>
>
> #I thought capture.output() would work, but the string still has the escaped characters
> v2 <- capture.output(cat(v1))
> v2
[1] "\t\t<HTML>\t\t\t<p>some content</p>\t\t \t<p> some more content </p>\t\t</HTML>"
1 answers
solution1
1 ACCPTED 2013-06-06 21:32:08
Your code is working fine, R is just printing your escaped characters as escapes. If you do
cat(paste(system("./f.py", intern=TRUE), collapse=""))
you should see your desired output.
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