The Fill function fills the mod m Matrix or Vector A with the specified value fillv. If a fill value, fillv, is not specified, 0 is used.  The value NULL is returned.

If fillv is the keyword random, the mod m Matrix or Vector A is filled with random values in the range .

The Fill function allows you to use sub-Matrix and sub-Vector specifications for the mod m Matrix or Vector. For example, the function can be used to clear specific rows of a Matrix, or part of a Vector.

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