remove orphaned udunits2 package

Author: Enchufa2

DESCRIPTION

@@ -15,7 +15,6 @@ Imports:
 LinkingTo:
     Rcpp (>= 0.12.10)
 Suggests:
-    udunits2,
     NISTunits,
     measurements,
     xml2,

README.md

@@ -27,7 +27,6 @@ derives from this manuscript and is kept up to date with the package development
 - Blog posts: [first](https://www.r-spatial.org/r/2016/06/10/units.html),
   [second](https://www.r-spatial.org/r/2016/08/16/units2.html),
   [third](https://www.r-spatial.org/r/2016/09/29/plot_units.html).
-- The [udunits2 R package](https://github.com/pacificclimate/Rudunits2) GitHub page.
 - The UNIDATA [udunits2](https://github.com/Unidata/UDUNITS-2) library at GitHub.
 
 ### What it does

demo/cf.R

@@ -7,4 +7,4 @@ cf_units = tb[[3]][2][[1]]
 u = lapply(cf_units, as_units, force_single_symbol=TRUE, check_is_valid=FALSE)
 names(u) = substr(tb[[3]][1][[1]], 1, 50)
 # does udunits2 understand them?
-all(sapply(u, udunits2::ud.is.parseable))
+all(sapply(u, units::ud_is_parseable))

vignettes/measurement_units_in_R.Rmd

@@ -29,8 +29,7 @@ This vignette is identical to @rj, except for two changes:
 ## Abstract
 We briefly review SI units, and discuss R packages that deal
 with measurement units, their compatibility and conversion.
-Built upon [udunits2](https://cran.r-project.org/package=udunits2)
-and the UNIDATA udunits library, we introduce the package
+Built upon the UNIDATA udunits library, we introduce the package
 [units](https://cran.r-project.org/package=units) that provides a
 class for maintaining unit metadata. When used in expression, it
 automatically converts units, and simplifies units of results when
@@ -180,7 +179,7 @@ NISTwattPerSqrMeterTOwattPerSqrInch(1:5)
 Both [measurements](https://cran.r-project.org/package=measurements) and [NISTunits](https://cran.r-project.org/package=NISTunits) are written entirely
 in R.
 
-## UNIDATA's udunits library and the `udunits2` R package
+## UNIDATA's udunits library
 
 Udunits, developed by UCAR/UNIDATA, advertises itself on [its web
 page](https://www.unidata.ucar.edu/software/udunits/)
@@ -190,50 +189,16 @@ of units and for conversion of numeric values between compatible
 units. The package contains an extensive unit database, which is
 in XML format and user-extendable._"
 
-The R package [udunits2](https://cran.r-project.org/package=udunits2)
-[@udunits2] provides a low-level R interface to the most important
-functions in the udunits2 C library.
-
-The functions provided by [udunits2](https://cran.r-project.org/package=udunits2) are
-```{r, eval=requireNamespace("udunits2", quietly=TRUE)}
-library(udunits2)
-ls(2)
-```
-Dropping the `ud` prefix,
-`is.parseable` verifies whether a unit is parseable
-```{r, eval=requireNamespace("udunits2", quietly=TRUE)}
-ud.is.parseable("m/s")
-ud.is.parseable("q")
-```
-`are.convertible` specifies whether two units are convertible
-```{r, eval=requireNamespace("udunits2", quietly=TRUE)}
-ud.are.convertible("m/s", "km/h")
-ud.are.convertible("m/s", "s")
-```
-`convert` converts units that are convertible, and throws an error otherwise
-```{r, eval=requireNamespace("udunits2", quietly=TRUE)}
-ud.convert(1:3, "m/s", "km/h")
-```
-and `get.name`, `get.symbol` and `set.encoding` get name, get symbol
-or modify encoding of the character unit arguments.
-```{r, eval=requireNamespace("udunits2", quietly=TRUE)}
-ud.get.name("kg")
-ud.get.symbol("kilogram")
-ud.set.encoding("utf8")
-```
-
 Unlike the
 [measurements](https://cran.r-project.org/package=measurements)
 and [NISTunits](https://cran.r-project.org/package=NISTunits),
-[udunits2](https://cran.r-project.org/package=udunits2) parses
+the underlying udunits2 C library parses
 units as expressions, and bases its logic upon the convertibility
 of expressions, rather than the comparison of fixed strings:
-```{r, eval=requireNamespace("udunits2", quietly=TRUE)}
+```{r}
 m100_a = paste(rep("m", 100), collapse = "*")
 dm100_b = "dm^100"
-ud.is.parseable(m100_a)
-ud.is.parseable(dm100_b)
-ud.are.convertible(m100_a, dm100_b)
+units::ud_are_convertible(m100_a, dm100_b)
 ```
 This has the advantage that through complex computations,
 intermediate objects can have units that are arbitrarily complex,
@@ -425,8 +390,7 @@ two set the class attribute of a vector or matrix.
 
 Despite all standardization efforts, units may still be ambiguous,
 or subject to interpretation. For instance for the duration of one
-year [NISTunits](https://cran.r-project.org/package=NISTunits)
-or [udunits2](https://cran.r-project.org/package=udunits2) give
+year [NISTunits](https://cran.r-project.org/package=NISTunits) gives
 us an answer that depends on whether we want a common, leap,
 Gregorian, Julian, tropical or siderial year (@lang, see
 also `demo(year)`).  This illustrates that those who apply

vignettes/measurement_units_in_R.bib

@@ -90,13 +90,6 @@ @Manual{NISTunits
     url = {https://CRAN.R-project.org/package=NISTunits}
 }
 
-@Manual{udunits2,
-    title = {udunits2: Udunits-2 Bindings for R},
-    author = {James Hiebert},
-    year = {2015},
-    note = {R package version 0.9}
-}
-
 @article{lubridate,
    author = {Garrett Grolemund and Hadley  Wickham},
    title = {Dates and Times Made Easy with lubridate},

vignettes/units.Rmd

@@ -36,8 +36,6 @@ We see here that the `units` method is used to retrieve and modify the
 unit of time differences. 
 
 The `units` package generalizes this idea to other physical units, building upon the
-[udunits2](https://cran.r-project.org/package=udunits2)
-R package, which in turn is build upon the
 [udunits2](https://www.unidata.ucar.edu/software/udunits/) C library.
 The `udunits2` library provides the following operations:
 
@@ -47,8 +45,8 @@ The `udunits2` library provides the following operations:
 * providing names and symbols for specific units
 * handle different character encodings (utf8, ascii, iso-8859-1 and latin1)
 
-The `units` R package uses R package
-[`udunits2`](https://cran.r-project.org/package=udunits2) to extend
+The `units` R package uses the
+[udunits2](https://www.unidata.ucar.edu/software/udunits/) C library to extend
 R with functionality for manipulating numeric vectors that have
 physical measurement units associated with them, in a similar way as
 `difftime` objects behave.