Subway3D vs Polynomial Regression

This app has a 3D representation of five different subway systems: Paris, Moscow, London, Tokyo and New York. The app is a 3D map, showing each subway station's location and the elevation and location of the subway lines in the station and between stations. If you are in the city, the app can determine the nearest subway station, and calculate a route to any other station in the system. The map can be zoomed, and rotated around the x,y or z axis to get a view of the system from any angle.

Polynomial Regression is your calculator and, more importantly, learning tool. You will be able to: * Construct polynomials of up to 20 degrees from either real or complex roots. * Interpolate polynomials from points by Lagrange, Newton or Vandermonde methods and Quadratic or Cubic splines. * Perform Least Squares approximation by orthogonal projection, with or without QR factorization, or partial derivatives. * Learn about each of the algorithms with derivations, proofs, step by step demonstrations, and visual tools. * Have an option to enter data by either typing or tapping on XY plane, and save data sets between program runs.