sigmoid

gma.math.correction.sigmoid

function sigmoid(data, constant = 1, ignore_value = None, inverse = False, cutoff = 0.5):

S-shaped curve function transformation. Reference equation: Out = 1 / (1 + exp(constant * (cutoff - (data - vmin) / vptp))) * vptp.

Parameters:

data: array.

The data to be corrected.

Optional:

constant = float. Default 1.

The constant term of the correction factor.

ignore_value = float||None. Default None.

The value that is not involved in the calculation.

inverse = bool. Default False.

Whether to perform the inverse change.

cutoff = bool. Default 0.5.

The intercept point of the S-curve. The default is the midpoint (0.5).

Returns:

Type: array.