spatstat: help with calculating number of clusters, cluster size

Hi,

I am new to spatial statistics and have a few basic queries. I am
analysing the spatial pattern of trees on a large plot. I wanted to
know if there is there some way of obtaining estimates of the number
of clusters and cluster-radius (in an iterative fashion) after fitting
a spatial point process to observed data (through 'ppm')?

Thanks in advance,
Soumya

Soumya Prasad
Centre for Ecological Sciences
Indian Institute of Science
Bangalore 560012
India