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Is there a way to find out what version of R certain functions were introduced in? For example regmatches is a useful function but it is fairly new and I believe it was introduced with 2.14. How could I easily figure out something like regmatches was introduced in R 2.14?
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The R function duplicated() returns a logical vector where TRUE specifies which elements of a vector or data frame are duplicates.
duplicated() function will return duplicated rows including the first of identical rows. logical: if TRUE , the function will return all variables in x after extracting duplicated or unique rows based on the variables specified in the argument ... .
unique() function in R Language is used to remove duplicated elements/rows from a vector, data frame or array.
Most of the times, we need to use packages in R and some packages are restricted to different versions in R, generally to newer versions. Therefore, we might need to find which version of R we are using. To find the R version, we can directly use the command R.Version ().
Check R Version With the sessioninfo () Function Another way of checking which version of R is installed is using the sessioninfo () function, which provides the current version and other details of the system it is running on, the current packages, and more.
As far as I can tell, the only way to get the version of a loaded package is the rather hackish: where pkg is the package name. EDIT: I am not sure when this function was added, but you can also use getNamespaceVersion, this is cleaner: Show activity on this post. Or after you are in the R shell print the contents of version$version.string
R programming is a free and Open-source package used for data analysis. I will show you two ways to find which version of R is installed in your system
Even easier than Dirk's solution is to use R's news function:
> newsDB <- news()
> news(grepl("regmatches",Text), db=newsDB)
Changes in version 2.14.0:
NEW FEATURES
o New function regmatches() for extracting or replacing matched or
non-matched substrings from match data obtained by regexpr(),
gregexpr() and regexec().
As of R-3.3.0, news will launch via the HTML help system if it is available. You can suppress it via the print.news_db method:
> print(news(grepl("news",Text), db=newsDB), doBrowse=FALSE)
Changes in version 3.3.0:
NEW FEATURES
o news() now displays R and package news files within the HTML help
system if it is available. If no news file is found, a visible
NULL is returned to the console.
You can use the SVN repository:
edd@max:~/svn/r-devel/src/library/base/man$ svn log regmatches.Rd
------------------------------------------------------------------------
r57006 | hornik | 2011-09-14 14:04:21 -0500 (Wed, 14 Sep 2011) | 1 line
Improve example.
------------------------------------------------------------------------
r56997 | hornik | 2011-09-12 15:16:03 -0500 (Mon, 12 Sep 2011) | 1 line
Document regmatches replacement function.
------------------------------------------------------------------------
r56893 | hornik | 2011-09-02 05:31:01 -0500 (Fri, 02 Sep 2011) | 1 line
Add first version of regmatches replacement function.
------------------------------------------------------------------------
r56818 | hornik | 2011-08-29 02:49:17 -0500 (Mon, 29 Aug 2011) | 1 line
Spelling.
------------------------------------------------------------------------
r56752 | hornik | 2011-08-18 01:40:07 -0500 (Thu, 18 Aug 2011) | 1 line
Add regmatches().
------------------------------------------------------------------------
edd@max:~/svn/r-devel/src/library/base/man$
I applied svn log to the manual page as I didn't immediately see the R file the function is defined in; the command would work the same way there...
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