where\({\overset{\overline{}}{x}}_{j},\ \ {\overset{\overline{}}{y}}_{j},\ \ {\overset{\overline{}}{M}}_{j}\ \)and \({\overset{\overline{}}{v}}_{\text{mj}}\) for\(j=\ 1,\ 2,\ \ldots,N\) are unknown coefficients, and\(L_{j}\left(\tau\right)\) are the Lagrange polynomials.