parallel coordinates for h/w (interactive -- FINAL!!)
This interactive parallel coordinates plot visualizes the Iris dataset, showing four measurements (sepal length, sepal width, petal length, petal width) across three flower species. Each colored polyline represents one observation, with red, blue, and green distinguishing Iris-setosa, Iris-versicolor, and Iris-virginica. Using d3.line and d3.scalePoint, the chart maps each dimension to a vertical axis. Users can drag any axis horizontally via d3.drag, which reorders the dimensions and smoothly transitions the paths with d3.transition, enabling exploration of relationships between different variable pairings. The axes display tick marks and rotated labels generated with d3.axisLeft.