Defining a vector valued function in sympy

I'm testing Sympy to speed up calculations. I'd like to define a function f:R->R^n, for this I can define a symbol t and define n u's (u_1 = Function('u1')(t), u_2 = ...) and then create a f = Function('f')(u1,u2,...) but this way is cumbersome. I was wondering if there is a more general method for this.