gusucode.com > 支持向量机工具箱 - LIBSVM OSU_SVM LS_SVM源码程序 > 支持向量机工具箱 - LIBSVM OSU_SVM LS_SVM\stprtool\quadrat\l2q2d.m
function [A,B,C]=l2q2d(alpha,theta) % L2Q2D transforms 5D hyperplane to 2D quadratic function. % [A,B,C]=ltoq2d(alpha,theta) % % L2Q2D transforms coefficients of hyperplane in 5D space % to coefficients of quadratic surface in 2D space. % % 5D: alpha'*y=theta ==> 2D: x'Ax + B'x + C = 0 % % This problem is related to quadratic non-linear mapping % (see help qtransf). % % Input: % alpha [5x1], theta [1x1] coefficients of hyperplane. % % Output: % A [2x2], B [2x1], C [1x1] coefficients of quadratic surface. % % % See also QTRANSF, QUADEMO. % % Statistical Pattern Recognition Toolbox, Vojtech Franc, Vaclav Hlavac % (c) Czech Technical University Prague, http://cmp.felk.cvut.cz % Written Vojtech Franc (diploma thesis) 19.11.1999 % Modifications % 24. 6.00 V. Hlavac, comments polished. A(1,1)=alpha(3); A(1,2)=alpha(4)/2; A(2,1)=alpha(4)/2; A(2,2)=alpha(5); B(1)=alpha(1); B(2)=alpha(2); C=-theta;