ERF Function

ERF.js

// Copyright (c) 2012 Sutoiku, Inc. (MIT License)

function ERF(lower_bound, upper_bound) {
  // Set number2 to zero if undefined
  upper_bound = (typeof upper_bound === 'undefined') ? 0 : upper_bound;

  // Return error if either number is not a number
  if (isNaN(lower_bound) || isNaN(upper_bound)) return '#VALUE!';
  
  // Return ERFC using jStat [http://www.jstat.org/]
  return jStat.erf(lower_bound);
}