# Changing Ring

## `ChangeRing(A, R): MtrxSprs, Rng -> MtrxSprs`

## `SparseMatrix(R, A): Rng, MtrxSprs -> MtrxSprs`

Given a sparse matrix $A$ over a ring $S$ having $m$ rows and $n$ columns, and another ring $R$, return the $m\times n$ sparse matrix over $R$ obtained by coercing the entries of $A$ from $S$ into $R$.

The argument order to `ChangeRing(A, R)` here is consistent with other forms of `ChangeRing`, while the `SparseMatrix(R, A)` form of this function is provided to be consistent with the sparse matrix creation functions above, for which the destination ring is the first argument, if supplied.