While playing around with the normal distribution, or more precisely, the probability density function:
$$\displaystyle f(x | \mu,\sigma^2) = \frac{1}{\sqrt{2 \pi \sigma^2}} e^{- \frac{(x - \mu)^2}{2 \sigma^2}}$$
I calculated the following curve:
The formula for this is just: $$f(x | \mu,\sigma^2) = pdf(x) - pdf(x-1)$$
It reminded me of an heart beat. What curve is this? Is this curve used anywhere?
I'm sorry if this is a simple question, I'm a little bad at mathematics.