small MaxEnt output values set to zero

[Andre van Proosdij]

Hi all,

 

I' m comparing MaxEnt predictions of species of different rarity classes. Some are very narow-ranged. The MaxEnt prediction values (logistic, but same result for raw) in less suitable areas are very small, which is obvious. However, prediction values for the most unsuitable areas are zero. It seems MaxEnt truncates all output values below 1E-45 to zero. What is the smallest output value MaxEnt can produce? Is it possible to get the real prediction values instead of truncated zeros?

 

This is the code I used, I use the batch form in R (maxent function in dismo package). The logistic output is used (default):

      m <- maxent(predictordata, PAidentifier, path = "D:/R/Virtualworld/outputs", args = c("projectionlayers=layers", "redoifexists", "notooltips", "noremoveduplicates", "noautofeature", "linear", "quadratic", "hinge", "noproduct", "nothreshold", "l2lqthreshold=1", "hingethreshold=15"))

Thanks in advance for your comments and thoughts!

 

Andre