utils.add

utils.add is an R package designed to facilitate an eclectic and evolving set of R operations commonly implemented by the author in the course of scientific research and/or other R packages. These functions generally fall into one of the following themes:

• Extract data
• Learn from data
• Modify data
• Common mathematical operations
• Development tools

It is important to emphasise that utils.add is not a comprehensive package designed to deliver any one of these themes: many R packages already fill this space. utils.add simply makes a few eclectic operations that can be loosely grouped into these themes a bit easier in cases where this has proven useful in the course of the author’s research.

Installation

You can install the development version of utils.add from GitHub with:

# install the development version from github:
devtools::install_github("edwardlavender/utils.add")

Extract data

Some functions facilitate data extraction. These include:

• isnt_na() – Extract observations which are not NA;
• substr_end() – Extract the last n letters from a character;
• pos_first_unique() – Extract the first position of each unique element in a vector;
• left() and right() – Explore the left and right hand side of a dataframe or matrix respectively;
• around() – Extract the rows in a dataframe around specified position(s);
• sterm() – Define mgcv model smooth term names (e.g. to extract values from mgcv::predict.gam());

Learn from data

Some functions which facilitate learning from data. These include:

• count_if() – Count the number of observations which meet a specified condition;
• basic_stats() – Compute basic statistics (e.g. mean, mode, etc.) for a sample;
• seq_range() – Generate a sequence between two values;
• round_range() – Round a range down and up at lower/upper limits respectively;
• clip_within_range() – Clip a vector to lie within a range;
• find_quantile_bin()– Find the quantile bin in which an observation belongs;
• summarise_along_walk() – Summarise every n numbers in a vector;
• est_prop() – Estimate proportions ± standard errors;
• dev_expl() – Calculate the % deviance explained by a model;

Modify data

Some functions facilitate data modification. The include:

• add_list_null() – Add list(NULL) to a list in replacement of NULL elements;
• list_merge() – Merge lists, accounting for empty lists;
• tidy_coef() – Tidy a table of coefficients;
• add_standard_attr() – Add standard attributes (such as the source file and the date) to an object;

Common mathematical functions

• linear() – A linear function based on parameters a and b;
• quadratic() – A quadratic function based on parameters a, b, h and k;
• sigmoid() – A (centred) sigmoidal function based on parameters x0, L and k;

Development tools

• load_internal_functions() – Load internal functions from a package into the global environment;
• check...() – Check arguments supplied via ... within a function;
• check_value() – Check that the value of an input supplied to a parent function is appropriate;
• check_class() – Check that the class of an inputted object supplied to a parent function is appropriate;
• check_tz() – Check the time zone of an object and, if appropriate and necessary, force UTC;
• check_names() – Check that required names are contained within an object;
• check_named_list() – Check that a list is named;
• check_length() – Check that the length of an object is the required length;

Disclaimer

utils.add is a new and ‘personal’ package at an early stage of evolution. Function names, arguments and availability may change.