Density, distribution function, and random generation
for the inverse Gaussian distribution with location `mu`

,
and shape `shape`

.

```
dinv_gaussian(x, mu = 1, shape = 1, log = FALSE)
pinv_gaussian(q, mu = 1, shape = 1, lower.tail = TRUE, log.p = FALSE)
rinv_gaussian(n, mu = 1, shape = 1)
```

- x, q
Vector of quantiles.

- mu
Vector of locations.

- shape
Vector of shapes.

- log
Logical; If

`TRUE`

, values are returned on the log scale.- lower.tail
Logical; If

`TRUE`

(default), return P(X <= x). Else, return P(X > x) .- log.p
Logical; If

`TRUE`

, values are returned on the log scale.- n
Number of draws to sample from the distribution.

See `vignette("brms_families")`

for details
on the parameterization.