5. Derivative specification

class lsqfitgp.Deriv(int)[source]

Class for specifying derivatives. Behaves like a dictionary str -> int, where the keys represent variables and values the derivation order. An empty Deriv means no derivatives. A Deriv with one single key None means that the variable is implicit.

Deriv(str) -> first derivative w.r.t. specified variable

Deriv(iter of str) -> derivative w.r.t. specified variables

Deriv(iter of int, str) -> an int before a str acts as a multiplier

Deriv(Deriv) -> pass through

Deriv(None) -> Deriv(0)

Example: Deriv([‘a’, ‘b’, ‘b’, ‘c’]) is equivalent to Deriv([‘a’, 2, ‘b’, ‘c’]).

Raises:
TypeError

If *args is not of the specified form.

ValueError

If *args ends with an integer or if there are consecutive integers.

Attributes:
implicit

True if the derivative is trivial or the variable is implicit.

order

The total derivation order, i.e., the sum of the values.

max

The maximum derivation order for any single variable.