| crochet-package | Implementation Helper for '[' and '[<-' of Custom Matrix-Like Types |
| convertIndex | Convert Non-Numeric Index Types to Positive Integers |
| extract | Create an Implementation of [ For Custom Matrix-Like Types |
| ijtok | Convert Two-Dimensional Indices i and j to One-Dimensional Index k |
| ktoij | Convert One-Dimensional Index k to Two-Dimensional Indices i and j |
| replace | Create an Implementation of [<- For Custom Matrix-Like Types |