Independent Variable

class pybamm.IndependentVariable(name, domain=None, auxiliary_domains=None)

A node in the expression tree representing an independent variable

Used for expressing functions depending on a spatial variable or time

Parameters:

• name (str) – name of the node
• domain (iterable of str) – list of domains that this variable is valid over
• *Extends –

class pybamm.Time

A node in the expression tree representing time

Extends: Symbol

new_copy()

See pybamm.Symbol.new_copy().

class pybamm.SpatialVariable(name, domain=None, auxiliary_domains=None, coord_sys=None)

A node in the expression tree representing a spatial variable

Parameters:

• name (str) – name of the node (e.g. “x”, “y”, “z”, “r”, “x_n”, “x_s”, “x_p”, “r_n”, “r_p”)
• domain (iterable of str) – list of domains that this variable is valid over (e.g. “cartesian”, “spherical polar”)
• *Extends –

new_copy()

See pybamm.Symbol.new_copy().

pybamm.t = the independent variable time

A node in the expression tree representing time

Extends: Symbol