Gaussian Distribution
The gaussian distribution, also called the normal distribution occurs in many places in life. It is defined like so:
$$ p(x | \mu, \sigma) = \frac{1}{\sqrt{2\pi \sigma^2}}exp(-\frac{(x-\mu)^2}{2\sigma^2}) $$
normal(x, mu, sd) = (1/(sd*sqrt(2*pi)))*exp(-(x-mu)**2/(2*sd**2))
plot [-3:3] normal(x,0,1)