## Copyright (C) 1996, 1997 Friedrich Leisch ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## ## This program is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with this file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: [in, out] = circle_in_square_set (n) ## ## Returns a 2 class training set of size n for the circle in a square ## classification problem. Inputs have uniform distribution on the ## 2-dimensional square -1 <= x,y <=1 and classified as ## C1 : x^2 + y^2 <= 2/pi ## C2 : x^2 + y^2 > 2/pi ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> ## Description: Data for circle in a square classification problem function [in, out] = circle_in_square_set (n) in = 2 * randn (n, 2) - 1; s = sumsq (in')'; out = [(s <= 2 / pi), (s > 2 / pi)]; endfunction

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