Sun, 02 Apr 2017

RApiDatetime 0.0.3

A brown bag bug fix release 0.0.3 of RApiDatetime is now on CRAN.

RApiDatetime provides six entry points for C-level functions of the R API for Date and Datetime calculations. The functions asPOSIXlt and asPOSIXct convert between long and compact datetime representation, formatPOSIXlt and Rstrptime convert to and from character strings, and POSIXlt2D and D2POSIXlt convert between Date and POSIXlt datetime. These six functions are all fairly essential and useful, but not one of them was previously exported by R.

I left two undefined variables in calls in the exported header file; this only become an issue once I actually tried accessing the API from another package as I am now doing in anytime.

Changes in RApiDatetime version 0.0.3 (2017-04-02)

  • Correct two simple copy-and-paste errors in RApiDatetime.h

  • Also enable registration in useDynLib, and explicitly export known and documented R access functions provided for testing

Courtesy of CRANberries, there is a comparison to the previous release. More information is on the rapidatetime page.

For questions or comments please use the issue tracker off the GitHub repo.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. Please report excessive re-aggregation in third-party for-profit settings.

/code/rapidatetime | permanent link

Sat, 25 Mar 2017

RApiDatetime 0.0.2

Two days after the initial 0.0.1 release, a new version of RApiDatetime has just arrived on CRAN.

RApiDatetime provides six entry points for C-level functions of the R API for Date and Datetime calculations. The functions asPOSIXlt and asPOSIXct convert between long and compact datetime representation, formatPOSIXlt and Rstrptime convert to and from character strings, and POSIXlt2D and D2POSIXlt convert between Date and POSIXlt datetime. These six functions are all fairly essential and useful, but not one of them was previously exported by R.

Josh Ulrich took one hard look at the package -- and added the one line we needed to enable the Windows support that was missing in the initial release. We now build on all platforms supported by R and CRAN. Otherwise, I just added a NEWS file and called it a bugfix release.

Changes in RApiDatetime version 0.0.2 (2017-03-25)

  • Windows support has added (Josh Ulrich in #1)

Changes in RApiDatetime version 0.0.1 (2017-03-23)

  • Initial release with six accessible functions

Courtesy of CRANberries, there is a comparison to the previous release. More information is on the rapidatetime page.

For questions or comments please use the issue tracker off the GitHub repo.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. Please report excessive re-aggregation in third-party for-profit settings.

/code/rapidatetime | permanent link

Thu, 23 Mar 2017

RApiDatetime 0.0.1

Very happy to announce a new package of mine is now up on the CRAN repository network: RApiDatetime.

It provides six entry points for C-level functions of the R API for Date and Datetime calculations: asPOSIXlt and asPOSIXct convert between long and compact datetime representation, formatPOSIXlt and Rstrptime convert to and from character strings, and POSIXlt2D and D2POSIXlt convert between Date and POSIXlt datetime. These six functions are all fairly essential and useful, but not one of them was previously exported by R. Hence the need to put them together in the this package to complete the accessible API somewhat.

These should be helpful for fellow package authors as many of us have either our own partial copies of some of this code, or rather farm back out into R to get this done.

As a simple (yet real!) illustration, here is an actual Rcpp function which we could now cover at the C level rather than having to go back up to R (via Rcpp::Function()):

    inline Datetime::Datetime(const std::string &s, const std::string &fmt) {
        Rcpp::Function strptime("strptime");    // we cheat and call strptime() from R
        Rcpp::Function asPOSIXct("as.POSIXct"); // and we need to convert to POSIXct
        m_dt = Rcpp::as<double>(asPOSIXct(strptime(s, fmt)));
        update_tm();
    }

I had taken a first brief stab at this about two years ago, but never finished. With the recent emphasis on C-level function registration, coupled with a possible use case from anytime I more or less put this together last weekend.

It currently builds and tests fine on POSIX-alike operating systems. If someone with some skill and patience in working on Windows would like to help complete the Windows side of things then I would certainly welcome help and pull requests.

For questions or comments please use the issue tracker off the GitHub repo.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. Please report excessive re-aggregation in third-party for-profit settings.

/code/rapidatetime | permanent link