Check if an 'externalptr' is a Null Pointer
person("Jonas", "Förster", email = "jonasfoerster@gmail.com", role = c("aut", "cre"))
Check if an 'externalptr' is a null pointer.
R does currently not have a native function for that purpose.
This package contains a C function that returns TRUE in case of a null pointer.

Isotonic Regression on Survival Analysis
Nonparametric estimation on survival analysis under order restrictions. It estimates monotone increasing or decreasing covariate effects in the proportional hazards model. Yunro Chung et al. (2018) <doi:10.1093/biomet/asx064>.

Discovery, Retrieval, and Analysis of Water Isotope Data
person("Gabe", "Bowen", email = "gabe.bowen@utah.edu",
role = c("aut", "cre"))
The wiDB...() functions provide an interface to the public API
of the wiDB <https://github.com/SPATIAL-Lab/isoWater/blob/master/Protocol.md>:
build, check and submit queries, and receive and
unpack responses. Data analysis functions support Bayesian
inference of the source and source isotope composition of water
samples that may have experienced evaporation. Algorithms
adapted from Bowen et al. (2018, <doi:10.1007/s00442-018-4192-5>).
R2jags, abind, R2WinBUGS, doParallel, foreach, httr, jsonlite
knitr, rmarkdown, testthat (>= 3.0.0), covr

knitr, rmarkdown, testthat (>= 3.0.0), covr, curl

Generate Isolines and Isobands from Regularly Spaced Elevation
Grids
person(given = "Claus",
family = "Wilke",
role = c("aut", "cre"),
email = "wilke@austin.utexas.edu")
A fast C++ implementation to generate contour lines (isolines) and
contour polygons (isobands) from regularly spaced grids containing elevation data.

covr, ggplot2, knitr, lwgeom, magick, microbenchmark,
rmarkdown, sf, testthat

covr, ggplot2, knitr, magick, microbenchmark, rmarkdown, sf,
testthat

c(person(given = "Claus O.",
family = "Wilke",
role = c("aut", "cre"),
email = "wilke@austin.utexas.edu",
comment = c(ORCID = "0000-0002-7470-9261")),
person(given = "Thomas Lin",
family = "Pedersen",
role = "aut",
email = "thomasp85@gmail.com",
comment = c(ORCID = "0000-0002-5147-4711")))
Claus O. Wilke [aut, cre] (<https://orcid.org/0000-0002-7470-9261>),
Thomas Lin Pedersen [aut] (<https://orcid.org/0000-0002-5147-4711>)