Function blocks returning a vector

Question

Can function blocks (Control→Functions & Tables) return vectors? If I use this syntax: 

[u[2]; u[1]] 

I get an error: 

Error evaluating parameter 'Expression' in component model/Fcn: While parsing: syntax error, unexpected '[' before '['.

Answer 1

From the block's help: "The input may be a scalar or vectorized continuous signal, the output is always a scalar continuous signal."  If your arithmetic is more complicated then above, then perhaps two Function blocks and a Multiplexer would achieve your desired goal.