MatrixView extends AbstractMatrix { @Override public Matrix like() { return matrix.like(rowSize(), columnSize()); } MatrixView(Matrix matrix, int[] offset, int[] size); @Override Matrix clone(); @Override double getQuick(int row, int column); @Override Matrix like(); @Override Matrix like(int rows, int columns); @Override void setQuick(int row, int column, double value); @Override int[] getNumNondefaultElements(); @Override Matrix viewPart(int[] offset, int[] size); @Override Matrix assignColumn(int column, Vector other); @Override Matrix assignRow(int row, Vector other); @Override Vector viewColumn(int column); @Override Vector viewRow(int row);  }
@Test public void testLike() { Matrix like = test.like(); assertTrue("type", like instanceof DenseMatrix); assertEquals("rows", test.rowSize(), like.rowSize()); assertEquals("columns", test.columnSize(), like.columnSize()); }
@Test public void testLikeIntInt() { Matrix like = test.like(4, 4); assertTrue("type", like instanceof DenseMatrix); assertEquals("rows", 4, like.rowSize()); assertEquals("columns", 4, like.columnSize()); }
@Test(expected = CardinalityException.class) public void testTimesMatrixCardinality() { Matrix other = test.like(5, 8); test.times(other); }