playgrounds/StackOverflowGetPackageQualification.md

In Melinae/TabularManifest: Tabular Manifest

Asked 2013-01-19 https://stackoverflow.com/questions/21224800/using-rs-get-function-while-qualifying-with-the-package

I'd like to assign a function to variable, using a character. The get() function in the base package does almost exactly what I want. For example,

valueReadFromFile <- "median" ds <- data.frame(X=rnorm(10), Y=rnorm(10)) dynamicFunction <- get(valueReadFromFile) dynamicFunction(ds$X)

However, I want to qualify the function with its package, so that I don't have to worry about (a) loading the function's package with library(), or (b) calling the wrong function in a different package.

Is there a robust, programmatic way I can qualify a function's name with its package using get() (or some similar function)? The following code doesn't work, presumably because get() doesn't know how to interpret the package name.

require(scales) #Has functions called alpha() and rescale() require(psych) #Also has functions called alpha() and rescale()

dynamicFunction1 <- get("scales::alpha") dynamicFunction2 <- get("psych::alpha")

Melinae/TabularManifest documentation built on Dec. 11, 2023, 1:48 a.m.