www.gusucode.com > stats 源码程序 matlab案例代码 > stats/generateCheckerBoardData.m
function [X,y] = generateCheckerBoardData(pps) % Generate data on a 4-by-4 checker board. Here's what the data will look % like: % % R B R B % B R B R % R B R B % B R B R % % Each letter above represents a square on a 4-by-4 checkerboard. B stands % for blue (y = -1) and R stands for red (y = 1). In each square, pps % points are generated from a distribution that is the product of uniform % distributions for the 2 X variables. The output X is N-by-2 and y is % N-by-1 where N is such that: N = 16*pps. % 1. First row. % 1.1 First square % x1 in (-2,-1) and x2 in (1,2) X11 = [unifrnd(-2,-1,pps,1),unifrnd(1,2,pps,1)]; y11 = ones(pps,1); % 1.2 Second square % x1 in (-1,0) and x2 in (1,2) X12 = [unifrnd(-1,0,pps,1),unifrnd(1,2,pps,1)]; y12 = -ones(pps,1); % 1.3 Third square % x1 in (0,1) and x2 in (1,2) X13 = [unifrnd(0,1,pps,1),unifrnd(1,2,pps,1)]; y13 = ones(pps,1); % 1.4 Fourth square % x1 in (1,2) and x2 in (1,2) X14 = [unifrnd(1,2,pps,1),unifrnd(1,2,pps,1)]; y14 = -ones(pps,1); % 2. Second row. % 2.1 First square % x1 in (-2,-1) and x2 in (0,1) X21 = [unifrnd(-2,-1,pps,1),unifrnd(0,1,pps,1)]; y21 = -ones(pps,1); % 2.2 Second square % x1 in (-1,0) and x2 in (0,1) X22 = [unifrnd(-1,0,pps,1),unifrnd(0,1,pps,1)]; y22 = ones(pps,1); % 2.3 Third square % x1 in (0,1) and x2 in (0,1) X23 = [unifrnd(0,1,pps,1),unifrnd(0,1,pps,1)]; y23 = -ones(pps,1); % 2.4 Fourth square % x1 in (1,2) and x2 in (0,1) X24 = [unifrnd(1,2,pps,1),unifrnd(0,1,pps,1)]; y24 = ones(pps,1); % 3. Third row. % 3.1 First square % x1 in (-2,-1) and x2 in (-1,0) X31 = [unifrnd(-2,-1,pps,1),unifrnd(-1,0,pps,1)]; y31 = ones(pps,1); % 3.2 Second square % x1 in (-1,0) and x2 in (-1,0) X32 = [unifrnd(-1,0,pps,1),unifrnd(-1,0,pps,1)]; y32 = -ones(pps,1); % 3.3 Third square % x1 in (0,1) and x2 in (-1,0) X33 = [unifrnd(0,1,pps,1),unifrnd(-1,0,pps,1)]; y33 = ones(pps,1); % 3.4 Fourth square % x1 in (1,2) and x2 in (-1,0) X34 = [unifrnd(1,2,pps,1),unifrnd(-1,0,pps,1)]; y34 = -ones(pps,1); % 4. Fourth row. % 4.1 First square % x1 in (-2,-1) and x2 in (-2,-1) X41 = [unifrnd(-2,-1,pps,1),unifrnd(-2,-1,pps,1)]; y41 = -ones(pps,1); % 4.2 Second square % x1 in (-1,0) and x2 in (-2,-1) X42 = [unifrnd(-1,0,pps,1),unifrnd(-2,-1,pps,1)]; y42 = ones(pps,1); % 4.3 Third square % x1 in (0,1) and x2 in (-2,-1) X43 = [unifrnd(0,1,pps,1),unifrnd(-2,-1,pps,1)]; y43 = -ones(pps,1); % 4.4 Fourth square % x1 in (1,2) and x2 in (-2,-1) X44 = [unifrnd(1,2,pps,1),unifrnd(-2,-1,pps,1)]; y44 = ones(pps,1); % 5. X and y. X = [X11;X12;X13;X14;X21;X22;X23;X24;X31;X32;X33;X34;X41;X42;X43;X44]; y = [y11;y12;y13;y14;y21;y22;y23;y24;y31;y32;y33;y34;y41;y42;y43;y44]; end