reconstruction of a space curve from curvature and torsion

It uses Runge-Kutta method for solving ODE and thus purely numerical.

% Usage: curve = naturalCurveD(k,t,isplotted)
% Input variable:
% k(kappa) - Curvature, which can be a single value or a
% vector
% t(tau) - Torsion, which can be a single value or a vector
% isplotted - binary value specifying whether the reconstructed
% curve is plotted or not.
% Output variable
% curve - Reconstructed curve