# Using Open Matrix¶

Larch embeds a python interface for interacting with open matrix (OMX) files. This data format rests on HDF5, the exact same underlying technology used in DT files. This makes merging and linking to open matrix data easy and fun. [citation needed]

class larch.OMX(filename)

A subclass of the tables.File class, adding an interface for openmatrix files.

As suggested in the openmatrix documentation, the default when creating an OMX file is to use zlib compression level 1, although this can be overridden.