## matrixM

Sparse M matrix.

Sparse M matrix.

M = matrixM(x)

M = matrixM(x) This function makes use of paper: Avoinding Similarity Transformations in the tau method - 2015 -(JosÃ© Matos et al.), and consists in to build the M matrx in some orthogonal polynomial basis. Here, we also implemented the orthogonal shift, and M matrix is sparse.

x = independent tau variable (itau object).

M = matrix such that Ma = xPa (sparse matrix).

matrixN and matrixO.