Uniform-on-a-box proposal

Builds an is_proposal that samples uniformly on the hyperrectangle \([\text{lower}_1, \text{upper}_1] \times \cdots \times [\text{lower}_p, \text{upper}_p]\) and reports the (constant) log-density on that box. Outside the box the log-density is -Inf.

Usage

is_uniform(n_dim, lower = -1, upper = 1)

Arguments

n_dim

Ambient dimension p.

lower

Length-p numeric vector of lower bounds (recycled from a single value).

upper

Length-p numeric vector of upper bounds (recycled from a single value).

Value

An is_proposal object.

See also

Other proposals: is_mvn(), is_mvt(), proposal_uniform()

Examples

q <- is_uniform(n_dim = 2L, lower = -5, upper = 5)
q
#> <is_proposal>: "is_uniform" in p = 2 dimensions
q@sample(3L)
#>           [,1]      [,2]
#> [1,] -3.506990 0.8660913
#> [2,] -1.363172 0.3978948
#> [3,]  2.871068 3.7388601