Dear list:
I have a ppp (i.e. spatstat) object representing a mapped stand of
~4000 trees. The polygon enclosing the stand is somewhat irregular
and
has 9 edges. I am using the 'siplab' package for spatially explicit
individual-based vegetation models, to calculate a simple
competition
index (Hegyiâs index, based on diameter of competitor tree divided
by diameter of target tree, times the reciprocal of distance between
them) using the example given in the package documentation, i.e.,
pairwise(myStandData, maxR = 6, kernel=powersker, kerpar =
list(pi=1, pj=1, pr=1, r0=0.3048, smark="diameter"))
 However, I am getting the error âError in imarks[[smark]] :
subscript out of boundsâ.
imarks[[smark]] refers to the diameter of the target tree, yet all
trees have diameter records -- there are no 'NA's. Can you suggest
how
I might troubleshoot this problem? I can post data to github if
necessary.
 Seth Bigelow
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