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Changelog

Source: NEWS.md

ndr 0.1.0

Initial release. Named-dimension arrays with coordinate-based indexing for R.

Core classes (S7)

  • Variable — N-dimensional array with named dimensions and attributes.
  • DataArray — Variable with attached coordinates for label-based access.
  • Dataset — collection of aligned Variables on shared dimensions. Extract variables with $ or [[.
  • ImplicitCoord — regular-grid coordinate defined by offset + step (zero memory, O(1) lookup). Slicing preserves implicitness when the subset is regular.
  • ExplicitCoord — arbitrary coordinate values (numeric, Date, character, etc.).

Operations

  • Arithmetic and comparison operators (+, *, >, etc.) broadcast by dimension name, not position. Disjoint dimensions produce outer-product-style expansion.
  • sel() — select by coordinate value (label-based, nearest-match for numeric).
  • isel() — select by integer index (1-based).
  • nd_mean(), nd_sum(), nd_min(), nd_max() — reduce along one or more named dimensions.

Coercion

  • as.data.frame() on DataArray produces long-format output (one row per cell) for use with ggplot2/dplyr.
  • as_variable() convenience constructor from R arrays.

Design notes

  • Single dependency: S7.
  • No file backends, lazy evaluation, or chunked compute — this is the foundation layer for those to build on.