Posts Tagged ‘ regular expressions ’

R related books: Traditional vs online publishing

October 12, 2011
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R related books: Traditional vs online publishing

How many R related books have been published so far? Who is the most popular publisher? How many other manuals, tutorials and books have been published online? Let's find out. A few years ago I used the publication list on r-project.org as an argument ...

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Example 8.27: using regular expressions to read data with variable number of words in a field

February 25, 2011
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Example 8.27: using regular expressions to read data with variable number of words in a field

A more or less anonymous reader commented on our last post, where we were reading data from a file with a varying number of fields. The format of the file was:1 Las Vegas, NV --- 53.3 --- --- 12 Sacramento, CA --- 42.3 --- --- 2The complication in the...

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Using Regular Expressions in R: Case Study in Cleaning a BibTeX Database

March 9, 2010
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Using Regular Expressions in R: Case Study in Cleaning a BibTeX Database

I recently had to clean up a BibTeX database containing around 1,000 references. One of the clean up tasks was to ensure that page numbers were separated with en-dashes as opposed to hyphens. This post sets out how I used regular expressions in R to co...

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