Advanced R 4 Data Programming and the Cloud: Using PostgreSQL, AWS, and Shiny

© Matt Wiley and Joshua F. Wiley 2020

M. Wiley, J. F. WileyAdvanced R 4 Data Programming and the Cloudhttps://doi.org/10.1007/978-1-4842-5973-3_4

4. Writing Functions

Matt Wiley¹  and Joshua F. Wiley²

(1)

Victoria College, Victoria, TX, USA

(2)

Monash University, Melbourne, VIC, Australia

 

Writing your own functions in R enables you to combine a set of R commands into a function that is easy to call and can be generalized. Functions are foundational to R. To become a more advanced user or developer of R, a good understanding of what functions are and how to write them is crucial. Broadly speaking, a function takes one or more inputs and processes them to produce and return output.

Not every programming task should be converted to a function. However, ...