Normalizes the distribution so that the total mass equals 1.

## Arguments

- d
A vector with `length(qp)`

elements representing
the unscaled density at each quadrature point.

- qp
Vector of equally spaced quadrature points.

## Value

A vector of `length(d)`

elements with
the prior density estimate at each quadature point.

## Examples

```
dscore:::normalize(c(5, 10, 5), qp = c(0, 1, 2))
#> [1] 0.25 0.50 0.25
sum(dscore:::normalize(rnorm(5), qp = 1:5))
#> [1] 1
```