uniquePresent: Extract unique non-missing value from vector

In philipdelff/NMdata: Preparation, Checking and Post-Processing Data for PK/PD Modeling

Extract unique non-missing value from vector

Description

Extract unique non-missing value from vector

Usage

uniquePresent(x, req.n1 = TRUE, na.pattern)

Arguments

x	A vector, either numeric or character.
req.n1	Require one unique value? If 'TRUE' (default), an error is thrown if non-unique values found. If 'FALSE', all the unique values are returned.
na.pattern	In addition to NA-elements, what text strings should be considered missing? Default is empty strings and strings only containing white spaces ('na.pattern="^ *$"').

Details

This function is particularly useful when combining data sets of which only some contain certain variables. uniquePresent with 'req.n1=TRUE' makes sure the result is a single unique value (e.g., within subjects). A typical use is carrying subject-level covariates from one data set to another in a longitudinal analysis.

Value

a vector of same class as 'x'

philipdelff/NMdata documentation built on March 5, 2025, 12:20 a.m.