def test_view_retains_ndarray_subclass():
    adata = ad.AnnData(np.zeros((10, 10)))
    adata.obsm["foo"] = np.zeros((10, 5)).view(NDArraySubclass)

    view = adata[:5, :]

    assert isinstance(view.obsm["foo"], NDArraySubclass)
    assert view.obsm["foo"].shape == (5, 5)
def force(title, pos, force, xlabel='', ax=0):
    """plot force vs position"""
    unit = 'N'
    scale = 1
    if min(force) < -9.9e3 or max(force) > 9.9e3:
        scale = 1e-3
        unit = 'kN'
    if ax == 0:
        ax = plt.gca()
    ax.set_title('{} / {}'.format(title, unit))
    ax.grid(True)
    ax.plot(pos, [scale*f for f in force])
    if xlabel:
        ax.set_xlabel(xlabel)
    if min(force) > 0:
        ax.set_ylim(bottom=0)