## verapproximation

Verify approximation.

Verify approximation.

f = verapproximation(x, equation, a, step)

f = verapproximation(x, equation, a, step) evaluates the approximated solution and compares it with the rhs.

x = independent tau variable (itau object). equation = equation (char). a = approximated coefficients (numeric vector). step = evaluation step (double).

f = error F(y_n(x))-f(x) (numeric vector).