_fragment_2_1(X, T, s)
The argument X is modified in-place, but this modification is not the same as the returned value of the function. This function also takes pains to do things in ways that are compatible with sparse matrices, for example by avoiding fancy indexing and by using methods of the matrices whenever possible instead of using functions of the numpy or scipy libraries themselves.
A helper function for expm_2009.
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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