The Identity function creates a mod m identity Matrix of the specified type and dimensions.

The allowable datatypes are hardware integer (dtype=integer[4]/integer[8] or integer[]), hardware float (dtype=float[8]), or Maple integer (dtype=integer). If specified, order can be C_order or Fortran_order. If not specified, C_order is used.

This command is part of the LinearAlgebra[Modular] package, so it can be used in the form Identity(..) only after executing the command with(LinearAlgebra[Modular]).  However, it can always be used in the form LinearAlgebra[Modular][Identity](..).