/// <summary>
/// Generate next random number.
/// </summary>
///
/// <returns>Returns next random number.</returns>
///
public double Next( )
{
// check if we can use second value
if (useSecond)
{
// return the second number
useSecond = false;
return(secondValue);
}
double x1, x2, w, firstValue;
// generate new numbers
do
{
x1 = rand.Next( ) * 2.0 - 1.0;
x2 = rand.Next( ) * 2.0 - 1.0;
w = x1 * x1 + x2 * x2;
}while (w >= 1.0);
w = Math.Sqrt((-2.0 * Math.Log(w)) / w);
// get two standard random numbers
firstValue = x1 * w;
secondValue = x2 * w;
useSecond = true;
// return the first number
return(firstValue);
}
/// <summary>
/// Generate next random number.
/// </summary>
///
/// <returns>Returns next random number.</returns>
///
public double Next( )
{
return(rand.Next( ) * length + min);
}
/// <summary>
/// Generate next random number
/// </summary>
///
/// <returns>Returns next random number.</returns>
///
public double Next( )
{
return(-Math.Log(rand.Next( )) / rate);
}