FromSet[{n1, n2}, {{r1, c1}, {r2, c2},...}] returns an array of dimensions n1 × n2 with one at positions given by {{r1, c1}, {r2, c2},...} and zero otherwise.
FromSet[{n1, n2}, {{r1, c1}, {r2, c2},...}, {r0, c0}] returns an array of dimensions {n1, n2}, with one at positions given by {{r1+r0, c1+c0}, {r2+r0, c2+c0},...} and zero otherwise.
FromSet[{n1, n2}, {{r1, c1}, {r2, c2},...}, {r0, c0}, {u,v}] returns an array of dimensions {n1, n2}, with u at positions given by {{r1+r0, c1+c0}, {r2+r0, c2+c0},...} and v otherwise.
