Dear R users,

Any idea of how to calculate an area of an overlap between two functions? The only R build in function that I found is I Similarity Statistic for Quantifying Niche Overlap and I am really not sure if this function is producing exactly what I am interested in since I was plotting functions and often got confused results (for example: got high value for the overlap of one pair and low for the other pair, while from the plot it looked like the first pair was overlapping better.) Can anyone please explain what's the reason behind such a behaviour? And does anyone has a suggestion of what function could be used for a calculation of an overlap area? The problem with 'Istat' function is also that it requires both data sets to have the same length, while I would be more interested in a function that enables overlap calculation even if data sets have different length. Looking forward to hearing from you! Have a good day. Ana

library(SDMTools)
a <- matrix(runif(30))
b <- matrix(runif(30))
Istat(a,b)
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