tauint

Tau integration evaluation.


Syntax
   [v, f] = tauint(step, x, fun, order)

Description
   Evaluates the integral term from an approximated function.

Inputs
   step  = evaluatrion step (double).
   x     = independent tau variable (itau object).
   fun   = function f(x) (char or double vector).
   order = derivative order (integer).

Outputs
   v    = v(x).
   f    = coefficients for the approximation int('fun(x)', order).

Examples
   x = itau('LegendreP', [0 1], 5);
   [v, f] = tauint(0.1, x, ''x^2-3*x+1'', 1); or:
   x = itau('LegendreP', [0 1], 5);
   [v, f] = tauint(0.1, x, [-1/6 -1 1/6]', 1);
   In the first example the function is
   interpolated by orthogonal basis whereas in the second the coefficients
   are already provided.

See also
  taufred, taudiff, taudiff.