gonum/matrix — pull request #23 by kortschak (2014-10-04 11:12:58+00:00)
Title: Remove Submatrix and Submatrixer

Submatrix(a, i, j, r, c) is trivially implemented as `m.View(a, i, j, r, c); m.Clone(m)`, and we do not provide the Copier equivalent which is arguable more useful.