compute_densities: Compute the densities of given vector
In anujkhare/iregnet: Regularized interval regression

C++ function to compute the density or distibution at each point of a given vector. The supported distributions are gaussian, logistic and (least) extreme value. This is used for testing, and may not be useful otherwise.

1	compute_densities(z, j, family)

`z`	Vector of points at which the densities are to be calculated.
`j`	If `1`, the returned vector contains 0, f, f'/f and f”/f, where, f is the density function of the given distribution. If 2, returned vector contains F, 1-F, f and f', where F is the distribution function.
`family`	The distribution of the data. `Guassian`, `logistic` and (least) `extreme value` distributions are supported.