## matrixO

Sparse O matrix related with integration.

Sparse O matrix related with integration.

O = matrixO(x)

O = matrixO(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 O matrx in some orthogonal polynomial basis. Here, we also implemented the orthogonal shift, and O matrix is sparse.

x = independent tau variable (dtau object).

O = matrix such that Oa = intZa (sparse matrix).

matrixM and matrixN.