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# Matrices table

The matrices table in the project_database is nothing more than an index of all matrix files contained in the matrices folder inside the AequilibraE project.

This index, which looks like below, has two main columns. The first one is the file_name, which contains the actual file name in disk as to allow AequilibraE to find the file, and name, which is the name by which the user should refer to the matrix in order to access it through the API.

As AequilibraE is fully compatible with OMX, the index can have a mix of matrix types (AEM and OMX) without prejudice to functionality.

See also

- `aequilibrae.project.Matrices()`

    Class documentation

- matrices table structure

    Data model