R help - Feb 2011 - Problem in simulating envelopes with R package "Spatstat"

Hi all,

While useing the R package "Spatstat" to detect the spatial point
pattern of
my data, I met a problem.  When I computes simulation envelopes with a
fitted point process model: Poisson cluster (Thomas) process
(kappa=2.751010e-05; sigma=5.634274e+01; mu=4.943639e+02), I cannot get the
high values of the envelope, which show "NA" , but the
"mmean"
values computed by averaging simulated values are available, this result
confused me. Is it a bug in this package or only caused by my data? How can
I solve this issue?


Thanks a lot

    #my code is as follow:

    >dist = seq(0, 12.5, 0.1)
    >species.c = kppm(species, ~ 1, "Thomas")
    >species.cenv = envelope(species.c, Kest, r=dist, nsim=999, nrank=5)



Jeff

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