Re: [R] Trouble with Functions
Haha no, TextWrangler.
And that was definitely it...I think what was happening is that when I
opened the text version of the book it opened in Notepad, which was
probably opened the txt file in RTF. Then I copied and pasted the function
code into TextWrangler and didn't even think about Smart Quotes. So I used
the Straighten Quote feature. It got through all the way to the last line
where I got an unexpected string error:
Error in source(/Documents/score.txt) :
/Documents/score.txt:13:25: unexpected INCOMPLETE_STRING
32: return(scores.df)
33: }
Is there a debug version I could be running or something that lists more
descriptive error explanations? That way I don't have to bother you guys
and embarrass myself so. :-)
Thank you for your help! I appreciate it.
On Wed, Jun 6, 2012 at 2:29 PM, Peter Ehlers [via R]
ml-node+s789695n4632578...@n4.nabble.com wrote:
On 2012-06-05 17:00, dougmcintosh wrote:
FYI - here are the errors (I can get rid of the first one by removing
the
progress parameter - which I understand controls whether a progress bar
is
displayed). The second one stops at the gsub call.
Maybe if someone could give me a properly formatted example I could work
from instead?
Thanks!
(the caret is underneath the ? after progress in the first case, and
under
the parenthesis in the second)
source('/Documents/score.txt')
Error in source(Documents/score.txt) :
/Users/dougmcintosh/Documents/score.txt:1:73: unexpected input
1: score.sentiment = function(sentences, pos.words, neg.words, .progress
= ?
source('/Documents/score.txt')
Error in source(Documents/score.txt) :
/Users/dougmcintosh/Documents/score.txt:15:17: unexpected input
14:
15: sentence = gsub(?
I think that your problems may lie with an inappropriate editor
that's using 'smart' quotes. Please say you're not using Word.
Peter Ehlers
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[R] Trouble with Functions
Hi guys,
I'm a new to R and following along with Tutorials using this book:
http://www.amazon.com/Practical-Statistical-Analysis-Non-structured-Applications/dp/012386979X
In one of them, they use the twitteR package and describe the following
function (see below). From what I can tell from the documentation (R),
there's a method to call it directly in an interactive session. The way it's
presented in the book, however, it appears it's formatted for a text file
that (I'm assuming) you call using source(). At any rate, when I read it
into the session using source I get errors and I can't find documentation on
what's wrong (or tell from the feedback). Hoping you can help!
/Implementing Our Sentiment Scoring Algorithm
To score each tweet, our score.sentiment() function uses laply() to iterate
through the input text. It strips punctuation and control characters from
each line using R’s regular expression-powered substitution function, gsub()
and uses match() against each word list to find matches:/
score.sentiment = function(sentences, pos.words, neg.words,
.progress=’none’)
{
require(plyr)
require(stringr)
# we got a vector of sentences. plyr will handle a list
# or a vector as an “l” for us
# we want a simple array of scores back, so we use
# “l” + “a” + “ply” = “laply”:
scores = laply(sentences, function(sentence, pos.words, neg.words) {
# clean up sentences with R’s regex-driven global substitute, gsub():
sentence = gsub(‘[[:punct:]]’, ”, sentence)
sentence = gsub(‘[[:cntrl:]]’, ”, sentence)
sentence = gsub(‘\\d+’, ”, sentence)
# and convert to lower case:
sentence = tolower(sentence)
# split into words. str_split is in the stringr package
word.list = str_split(sentence, ‘\\s+’)
# sometimes a list() is one level of hierarchy too much
words = unlist(word.list)
# compare our words to the dictionaries of positive negative terms
pos.matches = match(words, pos.words)
neg.matches = match(words, neg.words)
# match() returns the position of the matched term or NA
# we just want a TRUE/FALSE:
pos.matches = !is.na(pos.matches)
neg.matches = !is.na(neg.matches)
# and conveniently enough, TRUE/FALSE will be treated as 1/0 by sum():
score = sum(pos.matches) - sum(neg.matches)
return(score)
}, pos.words, neg.words, .progress=.progress)
scores.df = data.frame(score=scores, text=sentences)
return(scores.df)
}
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Re: [R] Trouble with Functions
FYI - here are the errors (I can get rid of the first one by removing the
progress parameter - which I understand controls whether a progress bar is
displayed). The second one stops at the gsub call.
Maybe if someone could give me a properly formatted example I could work
from instead?
Thanks!
(the caret is underneath the ? after progress in the first case, and under
the parenthesis in the second)
source('/Documents/score.txt')
Error in source(Documents/score.txt) :
/Users/dougmcintosh/Documents/score.txt:1:73: unexpected input
1: score.sentiment = function(sentences, pos.words, neg.words, .progress = ?
source('/Documents/score.txt')
Error in source(Documents/score.txt) :
/Users/dougmcintosh/Documents/score.txt:15:17: unexpected input
14:
15: sentence = gsub(?
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View this message in context:
http://r.789695.n4.nabble.com/Trouble-with-Functions-tp4632456p4632460.html
Sent from the R help mailing list archive at Nabble.com.
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