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Principal Component Analysis

Local route /interactive-explanation/principal-component-analysis/ now layers the lighter Engineering Sandbox essay shell, local font stack, play-first framing, and generated chapter navigation onto the published EV explainer while keeping the original interactive runtime and public provenance limited to the shared footer.

Open replica Open original

Upstream snapshot: public-built site capture verified 2026-03-14
Source family: setosa.io/ev

Source snapshot

The local route vendors the published PCA page HTML, stylesheet, and page script, then patches asset paths and page chrome so the runtime works cleanly under the /interactive-explanation/ subpath.

  • Live original verified against https://setosa.io/ev/principal-component-analysis/ on 2026-03-14.
  • The local copy removes EV branding, bylines, share widgets, newsletter prompts, analytics, and comments.
  • The interactive math and visualization flow still rely on the original Angular, D3, Three.js, and numeric.js runtime.
  • The route now also loads the lighter Engineering Sandbox shell so the page gains local typography, editorial framing, and chapter navigation without displacing the EV chart layouts.

Shared EV layer

  • ../ev/scripts/d3.js, angular.js, and common.js remain shared across Setosa EV routes.
  • ../ev/scripts/three.js, OrthographicTrackballControls.js, and numeric.js were added locally for this route.
  • principal-component-analysis/style.css now adds wrapper-level overflow handling so the wide visualizations stay usable on smaller screens.
  • ../../shared/engineering-sandbox.css and ../../shared/engineering-sandbox.js provide the local font stack, chapter rail, and mobile jump bar used by this essay rollout.

Asset and source map

  • principal-component-analysis/index.html owns local metadata, cleaned public shell, and relative asset paths.
  • principal-component-analysis/script.js keeps the original PCA math, 2D drag logic, 3D projection viewer, and UK-food plots.
  • principal-component-analysis/fb-thumb.png and the shared EV scripts are vendored for subpath-safe static hosting.

Known deviations

  • The public route no longer shows EV branding, author credits, share widgets, newsletter forms, analytics, or comments.
  • The local page adds a small docs link and shared footer, but leaves the interactive runtime unchanged.
  • The live PCA page currently ships fixed UK-food defra-d1 and defra-d2 views rather than a component-pair switcher, and the replica preserves that published surface.
  • The opening framing and section transitions were lightly rewritten for the Engineering Sandbox rollout, but the original EV interactions and formulas remain intact.

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