Note that uncertain values of independent current and voltage sources can also
be modeled as interval-valued parameters on the right-hand side b. These kind
of parameters can be moved to the matrix by the cost of introducing new rows
and columns.
In order to apply interval arithmetic in linear circuit analysis, it is necessary to use
a real formulation of the matrix equation. Hence, a complex-valued equation
system used for AC analysis needs to be reformulated [4]. The result corresponding
to each variable will be wrapped by a polygon in the complex plane
(wrapping effect).