Re: [R] Developing a web crawler

[antujsrv]

Hi Stefan,

Thanks for the links you shared in the post, but i am unable to access the
scripts and output. It requires a password. 
If you can let me know the password for the .rar file of the "scripts_other
5", it would be really helpful. 
thanks in advance.


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Re: [R] Developing a web crawler

[Evanescence]

Can i ask a question> Do I need a good math for developing a web crawler ? 
( I want to develop a simple web crawler to do something )

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Re: [R] Developing a web crawler / R "webkit" or something similar? [off topic]

[Matt Shotwell]

On 03/03/2011 08:07 AM, Mike Marchywka wrote:









Date: Thu, 3 Mar 2011 01:22:44 -0800
From: antuj...@gmail.com
To: r-help@r-project.org
Subject: [R] Developing a web crawler

Hi,

I wish to develop a web crawler in R. I have been using the functionalities
available under the RCurl package.
I am able to extract the html content of the site but i don't know how to go


In general this can be a big effort but there may be things in
text processing packages you could adapt to execute html and javascript.
However, I guess what I'd be looking for is something like a "webkit"
package or other open source browser with or without an "R" interface.
This actually may be an ideal solution for a lot of things as you get
all the content handlers of at least some browser.


Now that you mention it, I wonder if there are browser plugins to handle
"R" content ( I'd have to give this some thought, put a script up as
a web page with mime type "test/R" and have it execute it in R. )


There are server-side solutions for this sort of thing. See 
http://rapache.net/ . Also, there was a string of messages on R-devel 
some years ago addressing the mime type issue; beginning here: 
http://tolstoy.newcastle.edu.au/R/devel/05/11/3054.html . Though I don't 
know whether there was a resolution. Some suggestions were text/x-R, 
text/x-Rd, application/x-RData.


-Matt






about analyzing the html formatted document.
I wish to know the frequency of a word in the document. I am only acquainted
with analyzing data sets.
So how should i go about analyzing data that is not available in table
format.

Few chunks of code that i wrote:
w<-
getURL("http://www.amazon.com/Kindle-Wireless-Reader-Wifi-Graphite/dp/B003DZ1Y8Q/ref=dp_reviewsanchor#FullQuotes";)
write.table(w,"test.txt")
t<- readLines(w)

readLines also didnt prove out to be of any help.

Any help would be highly appreciated. Thanks in advance.


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--
Matthew S Shotwell   Assistant Professor   School of Medicine
 Department of Biostatistics   Vanderbilt University

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Re: [R] Developing a web crawler

[Stefan Th. Gries]

Hi

The book whose companion website is here

deals with many of the things you need for a web crawler, and
assignment "other 5" on that site
()
is a web crawler.

Best,
STG
--
Stefan Th. Gries
---
University of California, Santa Barbara
http://www.linguistics.ucsb.edu/faculty/stgries

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Re: [R] Developing a web crawler / R "webkit" or something similar?

[Mike Marchywka]

> Date: Thu, 3 Mar 2011 01:22:44 -0800
> From: antuj...@gmail.com
> To: r-help@r-project.org
> Subject: [R] Developing a web crawler
>
> Hi,
>
> I wish to develop a web crawler in R. I have been using the functionalities
> available under the RCurl package.
> I am able to extract the html content of the site but i don't know how to go

In general this can be a big effort but there may be things in 
text processing packages you could adapt to execute html and javascript.
However, I guess what I'd be looking for is something like a "webkit"
package or other open source browser with or without an "R" interface.
This actually may be an ideal solution for a lot of things as you get
all the content handlers of at least some browser. 


Now that you mention it, I wonder if there are browser plugins to handle
"R" content ( I'd have to give this some thought, put a script up as
a web page with mime type "test/R" and have it execute it in R. )



> about analyzing the html formatted document.
> I wish to know the frequency of a word in the document. I am only acquainted
> with analyzing data sets.
> So how should i go about analyzing data that is not available in table
> format.
>
> Few chunks of code that i wrote:
> w <-
> getURL("http://www.amazon.com/Kindle-Wireless-Reader-Wifi-Graphite/dp/B003DZ1Y8Q/ref=dp_reviewsanchor#FullQuotes";)
> write.table(w,"test.txt")
> t <- readLines(w)
>
> readLines also didnt prove out to be of any help.
>
> Any help would be highly appreciated. Thanks in advance.
>
>
> --
> View this message in context: 
> http://r.789695.n4.nabble.com/Developing-a-web-crawler-tp3332993p3332993.html
> Sent from the R help mailing list archive at Nabble.com.
>
> __
> R-help@r-project.org mailing list
> 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.
  
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Re: [R] Developing a web crawler

[Alexy Khrabrov]

On Mar 3, 2011, at 4:22 AM, antujsrv wrote:
> 
> I wish to develop a web crawler in R.

As Rex said, there are faster languages, but R string processing got better due 
to the stringr package (R Journal 2010-2).  When Hadley is done with it, it 
will be like having it all in R!

-- Alexy
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Re: [R] Developing a web crawler

[rex.dwyer]

Perl seems like a 10x better choice for the task, but try looking at the 
examples in ?strsplit to get started.

-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On 
Behalf Of antujsrv
Sent: Thursday, March 03, 2011 4:23 AM
To: r-help@r-project.org
Subject: [R] Developing a web crawler

Hi,

I wish to develop a web crawler in R. I have been using the functionalities
available under the RCurl package.
I am able to extract the html content of the site but i don't know how to go
about analyzing the html formatted document.
I wish to know the frequency of a word in the document. I am only acquainted
with analyzing data sets.
So how should i go about analyzing data that is not available in table
format.

Few chunks of code that i wrote:
w <-
getURL("http://www.amazon.com/Kindle-Wireless-Reader-Wifi-Graphite/dp/B003DZ1Y8Q/ref=dp_reviewsanchor#FullQuotes";)
write.table(w,"test.txt")
t <- readLines(w)

readLines also didnt prove out to be of any help.

Any help would be highly appreciated. Thanks in advance.


--
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http://r.789695.n4.nabble.com/Developing-a-web-crawler-tp3332993p3332993.html
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[R] Developing a web crawler

[antujsrv]

Hi,

I wish to develop a web crawler in R. I have been using the functionalities
available under the RCurl package.
I am able to extract the html content of the site but i don't know how to go
about analyzing the html formatted document.
I wish to know the frequency of a word in the document. I am only acquainted
with analyzing data sets.
So how should i go about analyzing data that is not available in table
format.

Few chunks of code that i wrote:
w <-
getURL("http://www.amazon.com/Kindle-Wireless-Reader-Wifi-Graphite/dp/B003DZ1Y8Q/ref=dp_reviewsanchor#FullQuotes";)
write.table(w,"test.txt")
t <- readLines(w) 

readLines also didnt prove out to be of any help.

Any help would be highly appreciated. Thanks in advance.


--
View this message in context: 
http://r.789695.n4.nabble.com/Developing-a-web-crawler-tp3332993p3332993.html
Sent from the R help mailing list archive at Nabble.com.

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and provide commented, minimal, self-contained, reproducible code.