Pseudo-likelihood estimation of a Strauss spatial point process.

Syntax:
	pplik(pp, R, ng=25)
Input
pp  a pp object
R   the fixed parameter `R'
Optional:
ng  use a `ng'  `ng' grid with border `R' in the domain for numerical integration.


Output
estimate for `c' in the interval `[0, 1]'.

See also
`Strauss'