_sub_period_array(self, other)
Array of DateOffset objects; nulls represented by NaT.
Subtract a Period Array/Index from self. This is only valid if self is itself a Period Array/Index, raises otherwise. Both objects must have the same frequency.
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Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)
SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them