matrixO

Sparse O matrix related with integration.


Syntax
   O = matrixO(x)

Description
   O = matrixO(x) This function makes use of paper:
   Avoinding Similarity Transformations in the tau method - 2015 -(José
   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.

Input
   x = independent tau variable (dtau object).

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

See also
  matrixM and matrixN.