I'm fairly new to R, and I'm trying to write out a population model that satisfies the following;
the system consists of s species, i= 1, 2,...,s network of interactions between species is specified by a (s x s) real matrix, C[i,j] x[i] being the relative population of the "ith" species (0 =< x[i] =< 1, sum(x[i]=1) the evolution rule being considered is as follows; xprime[i] = f[i] if x[i] > 0 or f[i] >= 0 xprime[i] = 0 if x[i] = 0 and f[i] < 0 where f[i] = sum(C[i,j]*x[j]) - x[i]*sum(C[k,j]*x[j]) I have a bit of attempted code written out, but are there any tricks or tips that would condense or make this mess look nicer? -Justin ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
