Implementation Helper for '[' and '[<-' of Custom Matrix-Like Types
Convert Non-Numeric Index Types to Positive Integers
tools:::Rd_package_title("crochet")
Create an Implementation of [ For Custom Matrix-Like Types
Convert Two-Dimensional Indices i and j to One-Dimensional Index k
Convert One-Dimensional Index k to Two-Dimensional Indices i and j
Create an Implementation of [<- For Custom Matrix-Like Types
Functions to help implement the extraction / subsetting / indexing function '[' and replacement function '[<-' of custom matrix-like types (based on S3, S4, etc.), modeled as closely to the base matrix class as possible (with tests to prove it).