Fig 3. Illustrative example.

(A) Matrix formulation of the problem with 120 labeled samples, (((x⁽¹⁾(t₁), x⁽²⁾(t₁), y(t₁)), …, ((x⁽¹⁾(t_l), x⁽²⁾(t_l), y(t_l))), and 300 unlabeled samples (((x⁽¹⁾(t_l+1), x⁽²⁾(t_l+1)), t_l+1), …, ((x⁽¹⁾(t_l+u), x⁽²⁾(t_l+u)), t_l+u)). (B) The points are distributed on a non-linear 1-dimensional manifold in the (x⁽¹⁾, x⁽²⁾) - plane. Some points, the snapshots, contain a value for the signal. (C) Result of the interpolation on the nonlinear manifold using the harmonic extension algorithm.