WhittakerW
WhittakerW[k, m, z] gives the Whittaker function .
Examples
Evaluate the Whittaker W function:
WhittakerW[1, 0.5, 2.0]
(* 0.27067 *)Plot the function:
Plot[WhittakerW[0.5, 0.25, x], {x, 0, 5}]Please visit the official Wolfram Language Reference for more details.