install:
install.packages("devtools")
devtools::install_github("jjlinscientist/useful")
or
$ git clone https://github.com/jjlinscientist/useful
$ R CMD INSTALL useful
dev_environment:
R version 3.5.1 (2018-07-02) -- "Feather Spray"
Copyright (C) 2018 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin17.6.0 (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under the terms of the
GNU General Public License versions 2 or 3.
For more information about these matters see
http://www.gnu.org/licenses/.
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