Re: [R] readPDF() -- unsure how to install xpdf to make this work?

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Sun, 16 Nov 2008 15:07:23 -0500

There is information on http;//batchfiles.googlecode.com on setting your PATH.

On Sun, Nov 16, 2008 at 2:41 PM, Tony Breyal <tony.breyal_at_googlemail.com> wrote:
> Hi,
>
> Uwe -- ahh, thank you kindly, I was able to do a web search after
> reading your post above in order to find a guide on how to set the
> path in windows (i wasn't aware that this is how a file is made
> avaiable to the system). I haven't got it to work yet, but at least
> i'm on the right track! also just after reading your post, i've
> discoverd the system() function in R, what wonderful thing that is!
>
> Clair -- I'm still working on getting the files to be accessable to
> the system, but in the mean time i have just discovered the system()
> function in R which is work around for the moment... so using your
> example, you could do:
> ## R code
>> system(paste('"C:/Program Files/xpdf/pdftotext.exe"', '"C:/Documents and Settings/clair/Desktop/test/r-intro.pdf"'), wait=FALSE)
>
> the above will create a new text document in your c:/../test folder.
>
>
> Now obviously, we want to use the readPDF() function in package: tm.
> so on my uni laptop, running windows XP, this is what i have done:
>
> 1. Click through: start >> control panel >> system
> 2. Click the Advanced tab.
> 3. Click Environment variables.
> 4. Click New (under 'system') to add a new variable name and value.
> 4a. name: pdftotext
> 4b. value: C:\Program Files\xpdf\pdftotext.exe
> 5. Click New (under 'system') to add a new variable name and value.
> 4a. name: pdfinfo
> 4b. value: C:\Program Files\xpdf\pdfinfo.exe
>

>
> In theory, i think, that should work. however so far it hasn't, so not
> quite sure what to do. but at least in the mean time we have the system
> () function as a work around. If you can figure out what i'm doing
> wrong (probably something obvious knowing me!) please do let me know.
>
> Cheers,
> Tony Breyal
>
>
>
> On 16 Nov, 18:14, Uwe Ligges <lig..._at_statistik.tu-dortmund.de> wrote:

>> clair.crossup..._at_googlemail.com wrote:
>> > I never said it *should* work.
>>
>> > I was simply trying something out that works on other types of files
>> > I've needed in the past (eg: html, csv, dat, etc.). I don't know the
>> > details of the pdf format, but I thought it was worth a try, certainly
>> > no harm in experimenting, and hence I learned that pdfs aren't stored
>> > in the same way that other files i've used in the past are. that's
>> > fine, good to learn new things.
>>
>> > As for trying the readPDF() function, yes, I have downloaded and used
>> > xpdf to convert pdfs into plain text since reading the OP email.
>> > However, ow you can make xpdf available to the system so that readPDF
>> > () works in R? i don't know, hence why I posted in this thread.
>>
>> > You clearly seem to have a solution, fancy sharing?
>>
>> Sure, I thought that could not be a real question:
>> Set your environment variable PATH so that it additionally points to the
>> directory where these tools are installed. As you would do for any other
>> software that is to be called without knowledge where it is installed.
>>
>> Uwe Ligges
>>
>>
>>
>> > Clair Crossupton xx
>>
>> > On 16 Nov, 12:34, Uwe Ligges <lig..._at_statistik.tu-dortmund.de> wrote:
>> >> clair.crossup..._at_googlemail.com wrote:
>> >>> Hello, I was just wondering if you had found a solution? I am having
>> >>> the same difficulty of converting pdf's into plain text documents in
>> >>> R. I originally thought I could use the readLines() function, but as
>> >>> you can see below that did not work.
>> >> Why the hell should it? It is designed to read *text* files. And what
>> >> you get below is exactly how your PDF file looks like if you read it as
>> >> text which it is NOT. Why do you not also go the readPDF() way (and yes,
>> >> it is not always possible nor reliable to go that way).
>>
>> >> Uwe Ligges
>>
>> >>> R> my.destfile <- "C:\\Documents and Settings\\clair\\Desktop\\test\\r-
>> >>> intro.pdf"
>> >>> R> my.url <- "http://cran.r-project.org/doc/manuals/R-intro.pdf"
>> >>> R> download.file(url = my.url, destfile=my.destfile, mode='wb')
>> >>> R> txt <- readLines(my.destfile)
>> >>> R> txt
>> >>> [1]
>> >>> "%PDF-1.4"
>> >>> [2]
>> >>> "%"
>> >>> [3] "1 0 obj
>> >>> <<"
>> >>> [4] "/Length 587
>> >>> "
>> >>> [5] "/Filter /
>> >>> FlateDecode"
>> >>> [6]
>> >>> ">>"
>> >>> [7]
>> >>> "stream"
>> >>> [8] "xmTM @\020+z\017&?\024tBL\020$d4*.\002\001<_f
>> >>> \017'W_wիrc;`GUOV&\006(R)\027[v6W7Tvb
>> >>> \030"uYt/N.5=\025S<bG "
>> >>> Warm Regards,
>> >>> Clair
>> >>> On 13 Nov, 15:10, Tony Breyal <tony.bre..._at_googlemail.com> wrote:
>> >>>> Dear R-Help,
>> >>>> I need to convert a set of '.pdf' files into an equivalent set of
>> >>>> '.txt' files. This is so that i can do some text mining on the
>> >>>> content.
>> >>>> In the latest R-News letter (http://cran.r-project.org/doc/Rnews/
>> >>>> Rnews_2008-2.pdf), the package 'tm' for text mining is mentioned. In
>> >>>> that lovely package, there is a function called 'readPDF()'. In order
>> >>>> to use this, ?readPDF says
>> >>>> "Note that this PDF reader needs both the tools pdftotext and
>> >>>> pdfinfo installed and accessable on your system."
>> >>>> These tools are available fromhttp://www.foolabs.com/xpdf/download.html
>> >>>> I am able to download this and use it easily from a dos window to
>> >>>> convert a pdf file into a txt file.
>> >>>> Question: how do i make these tools available to R, so that i can use
>> >>>> the readPDF() function?
>> >>>> Thank you in advance for any help, and I hope the above made sense.
>> >>>> Tony Breyal
>> >>>> ###OS = Windows Vista Ultimate>> sessionInfo()
>> >>>> R version 2.8.0 (2008-10-20)
>> >>>> i386-pc-mingw32
>> >>>> locale:
>> >>>> LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United Kingdom.
>> >>>> 1252;LC_MONETARY=English_United Kingdom.
>> >>>> 1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252
>> >>>> attached base packages:
>> >>>> [1] grid stats graphics grDevices utils datasets
>> >>>> methods base
>> >>>> other attached packages:
>> >>>> [1] tm_0.3-1 XML_1.98-1 Snowball_0.0-3
>> >>>> RWeka_0.3-14 rJava_0.6-0 Matrix_0.999375-16
>> >>>> lattice_0.17-15 filehash_2.0
>> >>>> loaded via a namespace (and not attached):
>> >>>> [1] proxy_0.4-1
>> >>>> ______________________________________________
>> >>>> R-h...@r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help
>> >>>> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
>> >>>> and provide commented, minimal, self-contained, reproducible code.
>> >>> ------------------------------------------------------------------------
>> >>> ______________________________________________
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>>
>> >> ______________________________________________
>> >> R-h...@r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help
>> >> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
>> >> and provide commented, minimal, self-contained, reproducible code.
>>
>> > ______________________________________________
>> > R-h..._at_r-project.org mailing list
>> >https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>>
>> ______________________________________________
>> R-h...@r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sun 16 Nov 2008 - 20:10:00 GMT

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