In order to output an array from a formula node, you must declare the array variable.
float32 Y[100]; /* Declare 100-element array output
Inside the formula node, you must work with the arrays just like in C. The left brace is this -> [. It is looking for something like Y[0] = 1 + X[0]; where X is an array input. To make things simple you may consider placing your Formula node as it stands right now into a FOR loop. Your 1D array input will auto-index and your output will become an array as it tunnels out of the loop.
Daniel L. Press
PrimeTest Corp.
www.primetest.com