# Exponential1D¶

class astropy.modeling.functional_models.Exponential1D(amplitude=1, tau=1, **kwargs)[source]

One dimensional exponential model.

Parameters
amplitudefloat, optional
taufloat, optional

Attributes Summary

 amplitude input_units This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or None if any units are accepted). param_names tau

Methods Summary

 evaluate(x, amplitude, tau) Evaluate the model on some input variables. fit_deriv(x, amplitude, tau) Derivative with respect to parameters

Attributes Documentation

amplitude = Parameter('amplitude', value=1.0)
input_units

This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or None if any units are accepted).

Model sub-classes can also use function annotations in evaluate to indicate valid input units, in which case this property should not be overridden since it will return the input units based on the annotations.

param_names = ('amplitude', 'tau')
tau = Parameter('tau', value=1.0)

Methods Documentation

static evaluate(x, amplitude, tau)[source]

Evaluate the model on some input variables.

static fit_deriv(x, amplitude, tau)[source]

Derivative with respect to parameters