Raise x to a power

x xexp y    xexp[x;y]

Where x and y are numerics, returns as a float where x is

• non-negative, x^y
• null or negative, 0n

q)2 xexp 8
256f

q)-2 2 xexp .5
0n 1.414214

q)1.5 xexp -4.2 0 0.1 0n 0w
0.1821448 1 1.04138 0n 0w