Re: [R] gsub issue in R 2.11.1, but not present in 2.9.2

[Uwe Ligges]

On 29.06.2010 19:19, Bert Gunter wrote:

Uwe:

Did you forget to add the "fixed = TRUE" parameter to your gsub call in your
reply?

Yes, thanks.

Uwe

gsub("N\\A", "NA", "N\\A")

[1] "N\\A"

gsub("N\\A","NA","N\\A",fixed=TRUE)

[1] "NA"

I only mention it because there is already sufficient confusion that the
typo may totally bewilder people.

-- Bert

Bert Gunter
Genentech Nonclinical Statistics

-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of Uwe Ligges
Sent: Tuesday, June 29, 2010 4:11 AM
To: Jason Rupert
Cc: r-help@r-project.org
Subject: Re: [R] gsub issue in R 2.11.1, but not present in 2.9.2



On 29.06.2010 12:47, Jason Rupert wrote:

Previously in R 2.9.2 I used the following to convert from an improperly

formatted NA string into one that is a bit more consistent.

gsub("N\A", "NA", "N\A", fixed=TRUE)

This worked in R 2.9.2, but now in R 2.11.1 it doesn't seem to work an

throws the following error.

Error: '\A' is an unrecognized escape in character string starting "N\A"

I guess my questions are the following:
(1) Is this expected behavior?
(2) If it is expected behavior, what is the proper way to replace "N\A"

with "NA" and "N\\A" with "NA"?


If your original text "thestring" contains "N\A", then the R
representation is "N\\A", and hence

gsub("N\\A", "NA", thestring)

If you want to try explicitly, you need to write

gsub("N\\A", "NA", "N\\A")

If you original text contains two backslashes, both have to be escaped as
in

gsub("N\\\\A", "NA", thestring)

Uwe Ligges

Thank you again for all the help and insight.

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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.