Outline of the operations we want to support. Click on links for special notes. Currently, we are not including "gets" (<-) functions, as those might be difficult for backends to support. Functional operations should be sufficient for now.

Constructors

• dlist
• darray
• dframe

Common operations

Accessors

• parts
• dim
• length
• names
• dimnames

Redundant with dim or dimnames but implementations might provide fast path:

• nrow
• ncol
• rownames
• colnames

Iteration

• mapply
• lapply, since the default coerces to list

Grouping

• split

Laziness

• collect

darray operations

Extraction

• [
• rev
• diag

Accessors

• is.na

Comparison

• %in%
• match
• Comparison group generic

Math

• Arith group generic
• Math group generic
• t

Logic

• Logic group generic
• which
• ifelse

Combination

• c
• rbind
• cbind

Summaries

• Summary group generic
• mean
• median
• quantile
• cor
• sd
• var
• unique, duplicated
• table
• head, tail
• colSums
• colMeans
• rowSums
• rowMeans
• Potentially more row/col summaries, including min, max, any, etc.

Sorting

• sort
• order
• rank

dlist operations

Extraction

• [[, $

Coercion

• unlist

dframe operations

This will share all operations with dlist, since a frame is an extension of list. Some have different semantics, though.

Filtering

• subset

Transformation

• transform

Summary

• aggregate
• xtabs

Combination

• rbind
• cbind
• merge

Evaluation

• with, within

Probably should not support

Use is() instead of these:

• is.dframe
• is.darray
• is.dlist
• is.dobject

Use as() instead of these:

• as.dlist
• as.darray
• as.dframe

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