static void SimulateXCOMShotsOnDie(ISampler <int> d20, int minHitValue)
{
for (int i = 0; i < 12; i++)
{
for (int j = 0; j < Console.WindowWidth; j++)
{
Console.Write(d20.Next() > minHitValue ? '*' : '_');
}
}
Console.WriteLine();
}
static void IllustrateCoinFlipRunsOnSampler(ISampler <bool> coin)
{
ConsoleColor oldColor = Console.ForegroundColor;
ConsoleColor[] colors =
{
ConsoleColor.White,
ConsoleColor.Gray,
ConsoleColor.Green,
ConsoleColor.DarkGreen,
ConsoleColor.DarkMagenta,
ConsoleColor.DarkRed,
ConsoleColor.Red
};
bool lastRunValue = coin.Next();
int lastRunLength = 0;
for (int i = 0; i < 80; i++)
{
for (int j = 0; j < Console.WindowWidth; j++)
{
bool value = coin.Next();
if (lastRunValue == value)
{
lastRunLength++;
}
else
{
lastRunLength = 0;
}
lastRunValue = value;
Console.ForegroundColor = colors[Math.Min(colors.Length - 1, lastRunLength)];
Console.Write(value ? 'H' : 'T');
}
}
Console.ForegroundColor = oldColor;
Console.WriteLine();
}
private void Coin_ShowsDistribution(ISampler <bool> coin, double p, int n)
{
int trueCount = 0;
int falseCount = 0;
for (int i = 0; i < n; i++)
{
if (coin.Next())
{
trueCount++;
}
else
{
falseCount++;
}
}
double stddev = Math.Sqrt(n * p * (1 - p));
double stddevDistance = Math.Abs((double)trueCount - n * p) / stddev;
Assert.IsTrue(Math.Abs(stddevDistance) < 3,
$"Coin sampler {stddevDistance} standard deviations from the mean");
}