public void Reduce_2D_to_1D_and_0D()
{
//>>> x = np.arange(9).reshape(3, 3)
//>>> x
//array([[0, 1, 2],
// [3, 4, 5],
// [6, 7, 8]])
//>>> x[1]
//array([3, 4, 5])
//>>> x[:,1]
//array([1, 4, 7])
//>>> x[2, 2]
//8
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 });
data.Reshape(3, 3);
Assert.AreEqual(new Shape(3, 3), data.Shape);
// return identical view
var view = data.GetView("1");
Assert.AreEqual(new Shape(3), view.Shape);
AssertAreEqual(new int[] { 3, 4, 5 }, view.ToArray <int>());
// return reduced view
view = data.GetView(":,1");
Assert.AreEqual(new Shape(3), view.Shape);
AssertAreEqual(new int[] { 1, 4, 7 }, view.ToArray <int>());
view = data.GetView("2,2");
Assert.AreEqual(Shape.Scalar, view.Shape);
AssertAreEqual(new int[] { 8 }, view.ToArray <int>());
// recursive dimensionality reduction
view = data.GetView("2").GetView("2");
Assert.AreEqual(Shape.Scalar, view.Shape);
AssertAreEqual(new int[] { 8 }, view.ToArray <int>());
}
public void SlicingWithNegativeIndex1()
{
var a = new UnmanagedStorage(np.arange(10).GetData(), new Shape(10));
a.GetView("-1").ToArray <int>().Should().BeEquivalentTo(new int[] { 9 });
a.GetView("-2").GetValue <int>(0).Should().Be(8);
a = new UnmanagedStorage(np.arange(10).GetData(), new Shape(1, 10));
a.GetView(":, -1").ToArray <int>().Should().BeEquivalentTo(new int[] { 9 });
a.GetView(":, 1:").GetView("-1, -2").ToArray <int>().Should().BeEquivalentTo(new int[] { 8 });
a.GetView(":, 1:").GetView("-1, -2").GetValue(0, 0).Should().BeEquivalentTo(8);
}
public void GetData_1D_Negative()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
// return reduced view
var view = data.GetView("-7:");
Assert.AreEqual(new Shape(7), view.Shape);
AssertAreEqual(new int[] { 3, 4, 5, 6, 7, 8, 9 }, view.ToArray <int>());
view = data.GetView(":-5");
Assert.AreEqual(new Shape(5), view.Shape);
AssertAreEqual(new int[] { 0, 1, 2, 3, 4 }, view.ToArray <int>());
view = data.GetView(":-6");
Assert.AreEqual(new Shape(4), view.Shape);
AssertAreEqual(new int[] { 0, 1, 2, 3, }, view.ToArray <int>());
view = data.GetView("-3:-2");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new int[] { 7 }, view.ToArray <int>());
// negative step!
view = data.GetView("-7::-1");
Assert.AreEqual(new Shape(4), view.Shape);
AssertAreEqual(new int[] { 3, 2, 1, 0 }, view.ToArray <int>());
view = data.GetView(":-5:-1");
Assert.AreEqual(new Shape(4), view.Shape);
AssertAreEqual(new int[] { 9, 8, 7, 6 }, view.ToArray <int>());
view = data.GetView(":-6:-1");
Assert.AreEqual(new Shape(5), view.Shape);
AssertAreEqual(new int[] { 9, 8, 7, 6, 5, }, view.ToArray <int>());
view = data.GetView("-2:-3:-1");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new int[] { 8 }, view.ToArray <int>());
}
public void TheUltimateTest______SliceReshapedSlicedReshapedSlicedArray()
{
var t = new UnmanagedStorage(np.arange(20).GetData(), new Shape(20));
var view = t.GetView("::-1");
view.Reshape(5, 4);
var v1 = view.GetView(":, 1:-1");
new NDArray(v1).ToString(flat: true).Should().Be("array([[18, 17], [14, 13], [10, 9], [6, 5], [2, 1]])");
v1.Reshape(1, 2, 5);
new NDArray(v1).ToString(flat: true).Should().Be("array([[[18, 17, 14, 13, 10], [9, 6, 5, 2, 1]]])");
var v2 = v1.GetView(":, ::-1, ::-2");
new NDArray(v2).ToString(flat: true).Should().Be("array([[[1, 5, 9], [10, 14, 18]]])");
v2.Reshape(2, 3, 1);
new NDArray(v2).ToString(flat: true).Should().Be("array([[[1], [5], [9]], [[10], [14], [18]]])");
var v3 = v2.GetView(":,::-2, 0");
new NDArray(v3).ToString(flat: true).Should().Be("array([[9, 1], [18, 10]])");
v3.SetData(ArraySlice.FromArray(new int[] { 99, 11, -18, -10 }));
new NDArray(v3).ToString(flat: true).Should().Be("array([[99, 11], [-18, -10]])");
new NDArray(v2).ToString(flat: true).Should().Be("array([[[11], [5], [99]], [[-10], [14], [-18]]])");
new NDArray(v1).ToString(flat: true).Should().Be("array([[[-18, 17, 14, 13, -10], [99, 6, 5, 2, 11]]])");
new NDArray(t).ToString(flat: true).Should().Be("array([0, 11, 2, 3, 4, 5, 6, 7, 8, 99, -10, 11, 12, 13, 14, 15, 16, 17, -18, 19])");
}
public void NestedView_2D()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
data.Reshape(2, 10);
//>>> x = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
//>>> x = x.reshape(2, 10)
//>>> x
//array([[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
// [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]])
// return identical view
var identical = data.GetView(":");
Assert.AreEqual(new Shape(2, 10), identical.Shape);
//>>> x[:, 1:9]
//array([[1, 2, 3, 4, 5, 6, 7, 8],
// [1, 2, 3, 4, 5, 6, 7, 8]])
var view1 = identical.GetView(":,1:9");
Assert.AreEqual(new Shape(2, 8), view1.Shape);
AssertAreEqual(new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8 }, view1.ToArray <int>());
//>>> x[:, 1:9][:,::- 2]
//array([[8, 6, 4, 2],
// [8, 6, 4, 2]])
var view2 = view1.GetView(":,::-2");
Assert.AreEqual(new Shape(2, 4), view2.Shape);
AssertAreEqual(new int[] { 8, 6, 4, 2, 8, 6, 4, 2 }, view2.ToArray <int>());
//>>> x[:, 1:9][:,::- 2][:,::- 3]
//array([[2, 8],
// [2, 8]])
var view3 = view2.GetView(":,::-3");
Assert.AreEqual(new Shape(2, 2), view3.Shape);
AssertAreEqual(new int[] { 2, 8, 2, 8 }, view3.ToArray <int>());
// all must see the same modifications, no matter if original or any view is modified
// modify original
data.SetData(ArraySlice.FromArray(new int[] { 0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 0, -1, -2, -3, -4, -5, -6, -7, -8, -9 }));
AssertAreEqual(new int[] { -1, -2, -3, -4, -5, -6, -7, -8, -1, -2, -3, -4, -5, -6, -7, -8 }, view1.ToArray <int>());
AssertAreEqual(new int[] { -8, -6, -4, -2, -8, -6, -4, -2 }, view2.ToArray <int>());
AssertAreEqual(new int[] { -2, -8, -2, -8 }, view3.ToArray <int>());
// modify views
view1.SetValue(88, 0, 7);
view1.SetValue(888, 1, 7);
AssertAreEqual(new int[] { 0, -1, -2, -3, -4, -5, -6, -7, 88, -9, 0, -1, -2, -3, -4, -5, -6, -7, 888, -9 },
data.ToArray <int>());
AssertAreEqual(new int[] { -1, -2, -3, -4, -5, -6, -7, 88, -1, -2, -3, -4, -5, -6, -7, 888 },
view1.ToArray <int>());
AssertAreEqual(new int[] { 88, -6, -4, -2, 888, -6, -4, -2 }, view2.ToArray <int>());
AssertAreEqual(new int[] { -2, 88, -2, 888 }, view3.ToArray <int>());
view3.SetValue(22, 0, 0);
view3.SetValue(222, 1, 0);
AssertAreEqual(new int[] { 0, -1, 22, -3, -4, -5, -6, -7, 88, -9, 0, -1, 222, -3, -4, -5, -6, -7, 888, -9 },
data.ToArray <int>());
AssertAreEqual(new int[] { -1, 22, -3, -4, -5, -6, -7, 88, -1, 222, -3, -4, -5, -6, -7, 888 },
view1.ToArray <int>());
AssertAreEqual(new int[] { 88, -6, -4, 22, 888, -6, -4, 222 }, view2.ToArray <int>());
AssertAreEqual(new int[] { 22, 88, 222, 888 }, view3.ToArray <int>());
}
public void DimensionalityReduction4D_to_1D()
{
var t = new UnmanagedStorage(np.arange(30).GetData(), new Shape(2, 1, 3, 5));
var view = t.GetView("0,0,:,0");
Assert.AreEqual(new Shape(3), view.Shape);
Assert.AreEqual(5, view.GetValue <int>(1));
Assert.AreEqual(10, view.GetValue <int>(2));
AssertAreEqual(new int[] { 0, 5, 10 }, view.ToArray <int>());
}
public void Reduce_1D_to_Scalar()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
Assert.AreEqual(new Shape(10), data.Shape);
// return scalar
var view = data.GetView("7");
Assert.AreEqual(Shape.Scalar, view.Shape);
AssertAreEqual(new int[] { 7 }, view.ToArray <int>());
}
public void ReshapeSlicedArray()
{
var t = new UnmanagedStorage(np.arange(20).GetData(), new Shape(2, 10));
var view = t.GetView(":, 5:");
Assert.AreEqual(new Shape(2, 5), view.Shape);
AssertAreEqual(new int[] { 5, 6, 7, 8, 9, 15, 16, 17, 18, 19 }, view.ToArray <int>());
view.Reshape(10);
Assert.AreEqual(new Shape(10), view.Shape);
new int[] { 5, 6, 7, 8, 9, 15, 16, 17, 18, 19 }.Should().BeEquivalentTo(view.ToArray <int>());
new NDArray(view).ToString(flat: true).Should().Be("array([5, 6, 7, 8, 9, 15, 16, 17, 18, 19])");
}
public void ExpandDimensions()
{
//>>> np.arange(6)
//array([0, 1, 2, 3, 4, 5])
//>>> np.arange(6).reshape(2, 3)
//array([[0, 1, 2],
// [3, 4, 5]])
//>>> a=np.arange(6).reshape(2,3)
//>>> b=a[:, 1:]
//>>> b
//array([[1, 2],
// [4, 5]])
//>>> c=b.reshape(2,1,2,1)
//>>> c
//array([[[[1],
// [2]]],
//
//
// [[[4],
// [5]]]])
var t = new UnmanagedStorage(np.arange(6).GetData(), new Shape(2, 3));
t.Shape.IsSliced.Should().Be(false);
var view = t.GetView(":, 1:");
view.Shape.IsSliced.Should().Be(true);
new NDArray(view).ToString(flat: true).Should().Be("array([[1, 2], [4, 5]])");
view.Reshape(2, 1, 2, 1);
view.Shape.IsSliced.Should().Be(true);
AssertAreEqual(new int[] { 1, 2, 4, 5 }, view.ToArray <int>());
// doing the same disecting with slicing which ToString would do
view.GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 1, 2, });
view.GetView("1").ToArray <int>().Should().BeEquivalentTo(new int[] { 4, 5, });
view.GetView("0").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 1, 2 });
view.GetView("0").GetView("0").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 1, });
view.GetView("0").GetView("0").GetView("1").ToArray <int>().Should().BeEquivalentTo(new int[] { 2, });
view.GetView("0").GetView("0").GetView("0").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 1, });
view.GetView("0").GetView("0").GetView("1").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 2, });
view.GetView("1").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 4, 5 });
view.GetView("1").GetView("0").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 4, });
view.GetView("1").GetView("0").GetView("1").ToArray <int>().Should().BeEquivalentTo(new int[] { 5, });
view.GetView("1").GetView("0").GetView("0").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 4, });
view.GetView("1").GetView("0").GetView("1").GetView("0").ToArray <int>().Should().BeEquivalentTo(new int[] { 5, });
// this is to show that ToString works in principle:
np.arange(4).reshape(2, 1, 2, 1).ToString(flat: true).Should().Be("array([[[[0], [1]]], [[[2], [3]]]])");
var nd = new NDArray(view);
// and now tostring of the reshaped
nd.ToString(flat: true).Should().Be("array([[[[1], [2]]], [[[4], [5]]]])");
}
public void NestedDimensionalityReduction()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 });
data.Reshape(3, 3);
Assert.AreEqual(new Shape(3, 3), data.Shape);
var view = data.GetView("2");
//Assert.AreEqual(new Shape(3), view.Shape);
//AssertAreEqual(new int[] { 6, 7, 8 }, view.ToArray<int>());
var view1 = view.GetView("2");
Assert.AreEqual(Shape.Scalar, view1.Shape);
AssertAreEqual(new int[] { 8 }, view1.ToArray <int>());
var view2 = view.GetView("1::-1");
Assert.AreEqual(new Shape(2), view2.Shape);
AssertAreEqual(new int[] { 7, 6 }, view2.ToArray <int>());
}
public void NestedView_1D()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
// return identical view
var identical = data.GetView(":");
Assert.AreEqual(new Shape(10), identical.Shape);
var view1 = identical.GetView("1:9");
Assert.AreEqual(new Shape(8), view1.Shape);
AssertAreEqual(new int[] { 1, 2, 3, 4, 5, 6, 7, 8, }, view1.ToArray <int>());
var view2 = view1.GetView("::-2");
Assert.AreEqual(new Shape(4), view2.Shape);
AssertAreEqual(new int[] { 8, 6, 4, 2, }, view2.ToArray <int>());
var view3 = view2.GetView("::-3");
Assert.AreEqual(new Shape(2), view3.Shape);
AssertAreEqual(new int[] { 2, 8 }, view3.ToArray <int>());
// all must see the same modifications, no matter if original or any view is modified
// modify original
data.SetData(ArraySlice.FromArray(new int[] { 0, -1, -2, -3, -4, -5, -6, -7, -8, -9 }));
var arr = view1.ToArray <int>();
AssertAreEqual(new int[] { -1, -2, -3, -4, -5, -6, -7, -8, }, view1.ToArray <int>());
AssertAreEqual(new int[] { -8, -6, -4, -2, }, view2.ToArray <int>());
AssertAreEqual(new int[] { -2, -8 }, view3.ToArray <int>());
// modify views
view1.SetValue(88, 7);
AssertAreEqual(new int[] { 0, -1, -2, -3, -4, -5, -6, -7, 88, -9 }, data.ToArray <int>());
AssertAreEqual(new int[] { -1, -2, -3, -4, -5, -6, -7, 88, }, view1.ToArray <int>());
AssertAreEqual(new int[] { 88, -6, -4, -2, }, view2.ToArray <int>());
AssertAreEqual(new int[] { -2, 88 }, view3.ToArray <int>());
view3.SetValue(22, 0);
AssertAreEqual(new int[] { 0, -1, 22, -3, -4, -5, -6, -7, 88, -9 }, data.ToArray <int>());
AssertAreEqual(new int[] { -1, 22, -3, -4, -5, -6, -7, 88, }, view1.ToArray <int>());
AssertAreEqual(new int[] { 88, -6, -4, 22, }, view2.ToArray <int>());
AssertAreEqual(new int[] { 22, 88 }, view3.ToArray <int>());
}
public void ReshapeSlicedArray1()
{
//>>> a
//array([[0, 1, 2],
// [3, 4, 5],
// [6, 7, 8]])
var t = new UnmanagedStorage(np.arange(9).GetData(), new Shape(3, 3));
var view = t.GetView(":, 1:");
//>>> a[:, 1:]
//array([[1, 2],
// [4, 5],
// [7, 8]])
view.Should().BeOfValues(1, 2, 4, 5, 7, 8).And.BeShaped(3, 2);
view.Reshape(2, 3);
//>>> a[:, 1:].reshape(2,3)
//array([[1, 2, 4],
// [5, 7, 8]])
view.Should().BeOfValues(1, 2, 4, 5, 7, 8).And.BeShaped(2, 3);
view.GetValue(0, 0).Should().Be(1);
view.GetValue(1, 0).Should().Be(5);
view.GetValue(1, 1).Should().Be(7);
view.GetValue(1, 2).Should().Be(8);
}
public void GetData_2D()
{
//>>> x = np.arange(9).reshape(3, 3)
//>>> x
//array([[0, 1, 2],
// [3, 4, 5],
// [6, 7, 8]])
//>>> x[:]
//array([[0, 1, 2],
// [3, 4, 5],
// [6, 7, 8]])
//>>> x[1:]
//array([[3, 4, 5],
// [6, 7, 8]])
//>>> x[1:,:]
//array([[3, 4, 5],
// [6, 7, 8]])
//>>> x[:, 1:]
//array([[1, 2],
// [4, 5],
// [7, 8]])
//>>> x[1:2, 0:1]
//array([[3]])
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 });
data.Reshape(3, 3);
Assert.AreEqual(new Shape(3, 3), data.Shape);
// return identical view
var view = data.GetView(":");
Assert.AreEqual(new Shape(3, 3), view.Shape);
AssertAreEqual(data.ToArray <int>(), view.ToArray <int>());
// return reduced view
view = data.GetView("1:");
Assert.AreEqual(new Shape(2, 3), view.Shape);
AssertAreEqual(new int[] { 3, 4, 5, 6, 7, 8 }, view.ToArray <int>());
view = data.GetView("1:,:");
Assert.AreEqual(new Shape(2, 3), view.Shape);
AssertAreEqual(new int[] { 3, 4, 5, 6, 7, 8 }, view.ToArray <int>());
view = data.GetView(":,1:");
Assert.AreEqual(new Shape(3, 2), view.Shape);
AssertAreEqual(new int[] { 1, 2, 4, 5, 7, 8 }, view.ToArray <int>());
view = data.GetView("1:2, 0:1");
Assert.AreEqual(new Shape(1, 1), view.Shape);
AssertAreEqual(new int[] { 3 }, view.ToArray <int>());
// return stepped view
//>>> x
//array([[0, 1, 2],
// [3, 4, 5],
// [6, 7, 8]])
//>>> x[::2]
//array([[0, 1, 2],
// [6, 7, 8]])
//>>> x[::3]
//array([[0, 1, 2]])
//>>> x[::- 1]
//array([[6, 7, 8],
// [3, 4, 5],
// [0, 1, 2]])
//>>> x[::- 2]
//array([[6, 7, 8],
// [0, 1, 2]])
//>>> x[::- 3]
//array([[6, 7, 8]])
view = data.GetView("::2");
Assert.AreEqual(new Shape(2, 3), view.Shape);
AssertAreEqual(new int[] { 0, 1, 2, 6, 7, 8 }, view.ToArray <int>());
view = data.GetView("::3");
Assert.AreEqual(new Shape(1, 3), view.Shape);
AssertAreEqual(new int[] { 0, 1, 2 }, view.ToArray <int>());
view = data.GetView("::-1");
Assert.AreEqual(new Shape(3, 3), view.Shape);
AssertAreEqual(new int[] { 6, 7, 8, 3, 4, 5, 0, 1, 2, }, view.ToArray <int>());
view = data.GetView("::-2");
Assert.AreEqual(new Shape(2, 3), view.Shape);
AssertAreEqual(new int[] { 6, 7, 8, 0, 1, 2, }, view.ToArray <int>());
view = data.GetView("::-3");
Assert.AreEqual(new Shape(1, 3), view.Shape);
AssertAreEqual(new int[] { 6, 7, 8, }, view.ToArray <int>());
// N-Dim Stepping
//>>> x[::2,::2]
//array([[0, 2],
// [6, 8]])
//>>> x[::- 1,::- 2]
//array([[8, 6],
// [5, 3],
// [2, 0]])
view = data.GetView("::2, ::2");
Assert.AreEqual(new Shape(2, 2), view.Shape);
AssertAreEqual(new int[] { 0, 2, 6, 8 }, view.ToArray <int>());
view = data.GetView("::-1, ::-2");
Assert.AreEqual(new Shape(3, 2), view.Shape);
AssertAreEqual(new int[] { 8, 6, 5, 3, 2, 0 }, view.ToArray <int>());
}
public void GetData_1D()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
Assert.AreEqual(new Shape(10), data.Shape);
// return identical view
var view = data.GetView(":");
Assert.AreEqual(new Shape(10), view.Shape);
AssertAreEqual(data.ToArray <int>(), view.ToArray <int>());
view = data.GetView("-77:77");
Assert.AreEqual(new Shape(10), view.Shape);
AssertAreEqual(data.ToArray <int>(), view.ToArray <int>());
// return reduced view
view = data.GetView("7:");
Assert.AreEqual(new Shape(3), view.Shape);
AssertAreEqual(new int[] { 7, 8, 9 }, view.ToArray <int>());
view = data.GetView(":5");
Assert.AreEqual(new Shape(5), view.Shape);
AssertAreEqual(new int[] { 0, 1, 2, 3, 4 }, view.ToArray <int>());
view = data.GetView("2:3");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new int[] { 2 }, view.ToArray <int>());
// return stepped view
view = data.GetView("::2");
Assert.AreEqual(new Shape(5), view.Shape);
AssertAreEqual(new int[] { 0, 2, 4, 6, 8 }, view.ToArray <int>());
view = data.GetView("::3");
Assert.AreEqual(new Shape(4), view.Shape);
AssertAreEqual(new int[] { 0, 3, 6, 9 }, view.ToArray <int>());
view = data.GetView("::77");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new[] { 0 }, view.ToArray <int>());
view = data.GetView("-77:77:77");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new[] { 0 }, view.ToArray <int>());
// negative step!
view = data.GetView("::-1");
Assert.AreEqual(new Shape(10), view.Shape);
AssertAreEqual(data.ToArray <int>().OfType <int>().Reverse().ToArray(), view.ToArray <int>());
view = data.GetView("::-2");
Assert.AreEqual(new Shape(5), view.Shape);
AssertAreEqual(new int[] { 9, 7, 5, 3, 1 }, view.ToArray <int>());
view = data.GetView("::-3");
Assert.AreEqual(new Shape(4), view.Shape);
AssertAreEqual(new int[] { 9, 6, 3, 0 }, view.ToArray <int>());
view = data.GetView("::-77");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new[] { 9 }, view.ToArray <int>());
view = data.GetView("77:-77:-77");
Assert.AreEqual(new Shape(1), view.Shape);
AssertAreEqual(new[] { 9 }, view.ToArray <int>());
}
public void Indexing_1D()
{
var data = new UnmanagedStorage(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
// return identical view
var view = data.GetView(":");
Assert.AreEqual(0, view.GetValue <int>(0));
Assert.AreEqual(5, view.GetValue <int>(5));
Assert.AreEqual(9, view.GetValue <int>(9));
view = data.GetView("-77:77");
Assert.AreEqual(0, view.GetValue <int>(0));
Assert.AreEqual(5, view.GetValue <int>(5));
Assert.AreEqual(9, view.GetValue <int>(9));
// return reduced view
view = data.GetView("7:");
Assert.AreEqual(7, view.GetValue <int>(0));
Assert.AreEqual(8, view.GetValue <int>(1));
Assert.AreEqual(9, view.GetValue <int>(2));
view = data.GetView(":5");
Assert.AreEqual(0, view.GetValue <int>(0));
Assert.AreEqual(1, view.GetValue <int>(1));
Assert.AreEqual(2, view.GetValue <int>(2));
Assert.AreEqual(3, view.GetValue <int>(3));
Assert.AreEqual(4, view.GetValue <int>(4));
view = data.GetView("2:3");
Assert.AreEqual(2, view.GetValue <int>(0));
// return stepped view
view = data.GetView("::2");
Assert.AreEqual(0, view.GetValue <int>(0));
Assert.AreEqual(2, view.GetValue <int>(1));
Assert.AreEqual(4, view.GetValue <int>(2));
Assert.AreEqual(6, view.GetValue <int>(3));
Assert.AreEqual(8, view.GetValue <int>(4));
view = data.GetView("::3");
Assert.AreEqual(0, view.GetValue <int>(0));
Assert.AreEqual(3, view.GetValue <int>(1));
Assert.AreEqual(6, view.GetValue <int>(2));
Assert.AreEqual(9, view.GetValue <int>(3));
view = data.GetView("-77:77:77");
Assert.AreEqual(0, view.GetValue <int>(0));
// negative step!
view = data.GetView("::-1");
Assert.AreEqual(9, view.GetValue <int>(0));
Assert.AreEqual(4, view.GetValue <int>(5));
Assert.AreEqual(0, view.GetValue <int>(9));
view = data.GetView("::-2");
Assert.AreEqual(9, view.GetValue <int>(0));
Assert.AreEqual(7, view.GetValue <int>(1));
Assert.AreEqual(5, view.GetValue <int>(2));
Assert.AreEqual(3, view.GetValue <int>(3));
Assert.AreEqual(1, view.GetValue <int>(4));
view = data.GetView("::-3");
Assert.AreEqual(9, view.GetValue <int>(0));
Assert.AreEqual(6, view.GetValue <int>(1));
Assert.AreEqual(3, view.GetValue <int>(2));
Assert.AreEqual(0, view.GetValue <int>(3));
view = data.GetView("77:-77:-77");
Assert.AreEqual(9, view.GetValue <int>(0));
}