Standard Matrix representation for a general D1 x D2 matrix.

This class is itself a template on the contained type T, the number of rows and the number of columns. Its data member is an array T[nrows*ncols] containing the matrix data. The data are stored in the row-major C convention. For example, for a matrix, M, of size 3x3, the data $[a_{0}, a_{1}, a_{2}, . . . . . . ., a_{7}, a_{8}]$ d are stored in the following order:

$M = (\begin{array}{ccc} a_{0} & a_{1} & a_{2} \\ a_{3} & a_{4} & a_{5} \\ a_{6} & a_{7} & a_{8} \end{array})$