I'm happy to announce a new major release of the grid package: http://hackage.haskell.org/package/grid https://github.com/mhwombat/grid/wiki (wiki) WHAT'S NEW: * The package now uses associated (type) synonyms instead of multi-parameter type classes with functional dependencies. * Added two new classes: FiniteGrid and BoundedGrid. Moved some functions from the Grid class to the other classes, as appropriate. For example, only finite grids need the "size" function, and only bounded grids need the "boundary" function. * Added Unbounded grids for square, hexagonal, and triangular tiles. * Updated the userguide to reflect the changes. ABOUT GRID: Grid provides tools for working with regular arrangements of tiles, such as might be used in a board game or self-organising map (SOM). Grid currently supports triangular, square, and hexagonal tiles, with various 2D and toroidal layouts. If you need a tile shape or layout that isn't currently provided, please let me know. See Math.Geometry.Grid for an example of how to use the package. Suggestions for improvement are welcome.