Differentiation for dtau object.
F = diff(y, order, value)
F = diff(y, order) returns the N matrix related with Na = diff(P)a.
or F = diff(y, order, value) returns the evaluated value.
y = dependent tau variable (dtau object).
order = derivative order (integer).
value = value to evaluate (double).
F = matrix such that Na = diff(P)a (double matrix). or
F = evaluated value (double vector).
int, volt and fred.
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and Tau Toolbox developers.