The function Map(f,M1,...,Mn) applies the function f to each element of M1, with extra arguments M2,...,Mn.

The function Map[k](f,M1,...,Mn) applies the function f to each element of Mk, with extra arguments M1,...,Mk-1,Mk+1,...,Mn.

For scalar Mk, the function Map[k](f,M1,...,Mn) is equivalent to f(M1,...,Mn).