Root function of exponent (x^z) with cubic interpolation near 0
function regExponent_cinterp extends TRANSFORM.Icons.Function; input Real x "Argument of root"; input Real deltax = 0.01 "Interpolation interval near 0"; input Real z(max = 3) = 0.5 "non-Integer exponent"; output Real y "Root or regularized root near zero"; end regExponent_cinterp;