Add variables (in raster format) to a PresenceAbscence object
Add variables (in raster format), usually environmental, to a PresenceAbsence object. Variables are included as additional columns containing the aggregate/summarize value of the variable(s) in each cell of the presence-absence matrix.
Variables to be added in
Function used to aggregate the variables(s) values over each cell. Note that this will only work for variables with a resolution value smaller (i.e. higher resolution) than the PAM.
The result is a presence-absence matrix of species with the variables added as columns at the right-end of the matrix (but see the 'onlyvar' argument).
PresenceAbsence and the
variable must be in the same projection.
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## Not run: data(temp) # Global mean temperature data(PAM) # Phyllomedusa presence-absence matrix # Mean temperature PAM_temp_mean <- lets.addvar(PAM, temp) # Standard deviation of temperature PAM_temp_sd <- lets.addvar(PAM, temp, fun = sd, onlyvar = TRUE) # Mean and SD in the PAM PAM_temp_mean_sd <- cbind(PAM_temp_mean, PAM_temp_sd) ## End(Not run)
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