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import numpy as np
import holoviews as hv
hv.extension('matplotlib')
A Overlay is a collection of HoloViews objects that are related in some way, to be displayed simultanously, overlaid in the space space. Like Layout and unlike other containers such as HoloMap , GridSpace and NdOverlay a Overlay is not dictionary like: it holds potentially heterogeneous types without any dimensioned keys.
A Overlay cannot contain any other container type other than NdOverlay but can contain any HoloViews elements. See Building Composite Objects for more details on how to compose containers. It is best to learn about Overlay and Layout together as they are very closely related objects that share many core concepts.
You can build a Overlay between any two HoloViews objects (which can have different types) using the * operator:
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xvals = [0.1* i for i in range(100)]
curve = hv.Curve((xvals, [np.sin(x) for x in xvals]))
scatter = hv.Scatter((xvals[::5], np.linspace(0,1,20)))
curve * scatter
In this example, we have a Overlay composed of a Curve element and a Scatter element.
For more information about both Overlay and Layout, see the Composing_Elements user guide.