float variance(float variable, float &mean, int &sample_size)
This function will compute the mean and variance from nearby samples. Similar to the way that VEX is able to compute derivatives, this function is able to inspect the
variable for a nearby area and compute the mean and variance of the
The function returns the
variance (σ2). The
mean value will also be returned along with the
sample_size indicating how many nearby samples were considered.