Cube root can be done with a compass-and-straightedge construction. Newton's method is an iterative method that can be used to calculate the cube root. For real floating-point numbers this method reduces to the following iterative algorithm to produce successively better approximations of the cube root of "a": The method is simply averaging three factors chosen such that at each iteration. Halley's method improves upon this with an algorithm that converges more quickly with each step, albeit consuming more multiplication operations: With either method a poor initial approximation of "x" can give very poor algorithm performance, and coming up with a good initial
The Cube (film) getting out of the Cube. After the band leaves, Mr. Thomas briefly enters telling the Man that the "Rest Period" is over. A prisoner named Watson (Jack Van Evera) enters the Cube having escaped from his Cube. He notices that the Man hasn't been here for long while mentioning how his Cube had squares while the Man's Cube has rectangles. Watson tells the Man that he had to tell how many times has passed by making marks in his thumbnail which didn't work when he lost his thumbnails. Watson decides to return to his Cube to see if he left