Syntax

   F = diff(y, order, value)

Description

   F = diff(y, order) returns the N matrix related with Na = diff(P)a.
   or F = diff(y, order, value) returns the evaluated value.

Inputs

   y     = dependent tau variable (dtau object).
   order = derivative order (integer).
   value = value to evaluate (double).

Output

   F     = matrix such that Na = diff(P)a (double matrix). or
   F     = evaluated value (double vector).

See also

  int, volt and fred.