No, your code sums all values from both the arrays and puts the result in a single variable. Besides it's not a function. Here is an example that does what your describe.

Code Example

1. int[] p = { 5, 10, 15 };
2. int[] q = { 2, 4, 6 };
3.  
4. void setup() {
5.   int[] n = combineArrays(p, q);
6.   println(n);
7.   exit();
8. }
9.  
10. int[] combineArrays(int[] old1, int[] old2) {
11.   int [] newArray = new int[old1.length+old2.length];
12.   arrayCopy( old1, 0, newArray, 0, old1.length);
13.   arrayCopy( old2, 0, newArray, old1.length, old2.length );
14.   return newArray;
15. }

Not quite, what it is doing there is adding the elements of arrays p and q into one value. Based on your question, it sounds like what you want is this (one array with all the elements of p and q):

thanks guy :D