Creates a quadratic feature that evaluates to linear_val^2 where
linear_val = (values[i] - min) / (max - min).
Usage
maxent_quadratic_feature(values, name, min_val = NULL, max_val = NULL)
Arguments
- values
Numeric vector of environmental variable values.
- name
Character string: feature name/identifier.
- min_val
Minimum value for normalization. If NULL (default),
computed as min(values).
- max_val
Maximum value for normalization. If NULL (default),
computed as max(values).
Value
External pointer to a QuadraticFeature C++ object.
Examples
vals <- c(0, 5, 10)
f <- maxent_quadratic_feature(vals, "temperature_sq")
maxent_feature_eval(f, 2) # evaluates at index 2 (1-based -> 0-based: 1)
#> [1] 0.25
