[R] speed issue: gsub on large data frame

Simon Pickert simon.pickert at t-online.de
Tue Nov 5 09:13:12 CET 2013

How’s that not reproducible?

1. Data frame, one column with text strings
2. Size of data frame= 4million observations
3. A bunch of gsubs in a row (  gsub(patternvector, “[token]“,dataframe$text_column)  )
4. General question: How to speed up string operations on ‘large' data sets?

Please let me know what more information you need in order to reproduce this example? 
It’s more a general type of question, while I think the description above gives you a specific picture of what I’m doing right now.

General question: 
Am 05.11.2013 um 06:59 schrieb Jeff Newmiller <jdnewmil at dcn.davis.CA.us>:

> Example not reproducible. Communication fail. Please refer to Posting Guide.
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> Sent from my phone. Please excuse my brevity.
> Simon Pickert <simon.pickert at t-online.de> wrote:
>> Hi R’lers,
>> I’m running into speeding issues, performing a bunch of 
>> „gsub(patternvector, [token],dataframe$text_column)"
>> on a data frame containing >4millionentries.
>> (The “patternvectors“ contain up to 500 elements) 
>> Is there any better/faster way than performing like 20 gsub commands in
>> a row?
>> Thanks!
>> Simon
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>> and provide commented, minimal, self-contained, reproducible code.

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