Array as an input

I have an input A into a function and I want to define the function as a 3-by-4 matrix. How do I write the input?

Answer 1

[the cyclist]

Define the function like this

function [out_stuff] = fa(in_stuff)
  out_stuff = 2*in_stuff; % Or whatever
end

Call it like this:

A = rand(3,4);
outA = fa(A);