This example compares two visualization methods for the same network data: a node-link diagram rendered with `d3.forceSimulation` and an adjacency matrix. Node circles are colored by group and support drag, while clicking either a node or a matrix cell highlights its corresponding row and column in the matrix and dims other links. The matrix uses `d3`-appended SVG rects with fill opacity based on edge weight, and zooming is enabled via `d3.zoom`. The data appears to describe a Dublin contact network with 410 nodes.