[R] Reading a web page in pdf format

Gabor Grothendieck ggrothendieck at gmail.com
Wed May 9 19:46:54 CEST 2007

Modify this to suit.  After grepping out the correct lines we use strapply
to find and emit character sequences that come after a "(" but do not contain
a ")" .  back = -1 says to only emit the backreferences and not the entire
matched expression (which would have included the leading "(" ):

URL <- "http://www.snamretegas.it/italiano/business/gas/bilancio/pdf/bilancio.pdf"
Lines.raw <- readLines(URL)
Lines <- grep("Industriale|Termoelettrico", Lines.raw, value = TRUE)
strapply(Lines, "[(]([^)]*)", back = -1, simplify = rbind)

which gives a character matrix whose first column is the label
and second column is the number in character form.  You can
then manipulate it as desired.

On 5/9/07, Vittorio <vdemart1 at tin.it> wrote:
> Each day the daily balance in the following link
> http://www.
> snamretegas.it/italiano/business/gas/bilancio/pdf/bilancio.pdf
> is
> updated.
> I would like to set up an R procedure to be run daily in a
> server able to read the figures in a couple of lines only
> ("Industriale" and "Termoelettrico", towards the end of the balance)
> and put the data in a table.
> Is that possible? If yes, what R-packages
> should I use?
> Ciao
> Vittorio
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