DiscreteChar dnaChar = (DiscreteChar) dnaType.getDefaultCharacter();
assertTrue("Failed to load dna character", dnaChar != null);
MatrixColumn c1 = new MatrixColumn();
c1.setCharacter(dnaChar);
matrix.addColumn(c1);
MatrixColumn c2 = new MatrixColumn();
c2.setCharacter(dnaChar);
matrix.addColumn(c2);