[R] extracting information from txt file

[Rui Barradas]

Hello,

Use readLines instead.

?readLines  # see argument 'n'
readLines("http://www.epa.gov/emap/html/data/surfwatr/data/mastreams/9396/wchem/chmval.txt", 
n = 5)[5]


Hope this helps,

Rui Barradas
Em 31-10-2012 16:46, chuck.01 escreveu:
> Hello,
>
> Here is a link to some data:
> http://www.epa.gov/emap/html/data/surfwatr/data/mastreams/9396/wchem/chmval.txt
>
> I am trying to read this in, and want to use:
> chmval <-
> read.table("http://www.epa.gov/emap/html/data/surfwatr/data/mastreams/9396/wchem/chmval.txt",
> sep=",", skip= 84, header=T)
>
> the # 84, for 84 lines skipped needs to be derived from the 5th line of the
> txt file
> # Header Records:  85
>
> so, I need that # (-1) for input into the read.table statement above
>
> I've tried grep but that didn't work:
>   (for this I downloaded the txt file and manually removed that hash mark!)
>
> grep("Header Records:", read.table("chmval.txt", header=T))
> Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,
> :
>    line 1 did not have 5 elements
>
> Any ideas?
> Can I just extract the 5th line?
>
>
>
>
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