private void computeEquationParts(){
  expMultiplier=Math.sqrt(2.0 * Math.PI) / sigma / rho;
  expMember=4.0 * sigma * sigma;
}

private void computeEquationParts ( ) { expMultiplier = Math . sqrt ( 2.0 * Math . PI ) / sigma / rho ; expMember = 4.0 * sigma * sigma ; }
computer both members of the equation
