[R-sig-eco] Error in Maxent (dismo package)

[Irene Rojo]

Dear all,

I am fitting maxent models within the dismo package but I have some doubts
regarding the number of categorical variables (factors) that I can include
in the model. All my variables are raster (.asc).

When I perform the model with just one factor (me <- maxent(predictors,
occtrain, factors="bion")) it runs and everything works fine, but when I
try to add more factors (me <- maxent(predictors, occtrain, factors="bion",
"morfo", "sed")) I get the following error:

Error in .getMatrix(a) :
  data should be  a matrix, data.frame, or SpatialPoints* object

When I just include one factor (whatever the variable is) it works, so I
don't know if it is a syntax problem and I am not including the rest of the
factors in a proper way (separated by commas), or if it is not possible to
add more than one factor.

Any advice will be much appreciated!

Thanks in advance,

Irene

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