lsapy.functions.logistic#

lsapy.functions.logistic(x, a, b)[source]#

Logistic function capped to 1.

This function should be used on sigmoid-like suitability data. The function can be used on both positive and negative values of x, as well as on increasing and decreasing sigmoid-like data.

Parameters:

  • x (any) – Input values.

  • a (float | int) – Steepness of the function parameter.

  • b (float | int) – Value of the function’s midpoint.

Returns:

Output values.

Return type:

float

Notes

The function is defined as:

\[f(x) = \frac{1}{1 + e^{-a(x - b)}}\]