HRStrauss: Hastings ratio for the Strauss model
In adchSTATS/spatstat3dadd: Additions to spatstat

Function used for calculating the hastings ratio used for simulation with the Metropolis-Hastings algorithm, rStrauss.

1	HRStrauss(x, x_prop, xi, h, beta, gamma, R, birth = TRUE)

`x`	A point pattern of class `pp3`.
`x_prop`	A point proposed to be added to the point pattern.
`xi`	A point in `x`.
`h`	The hardcore parameter.
`beta`	The intensity parameter.
`gamma`	The interaction parameter.
`R`	The interactionradius parameter.
`birth`	A parameter indicating whether the death or birth Hasting ratio should be calculated.