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\LS_SVMlab\poly_kernel.m
function x = poly_kernel(a,b, d) % polynomial kernel function for implicit higher dimension mapping % % X = poly_kernel(a,b,[t,degree]) % % 'a' can only contain one datapoint in a row, 'b' can contain N % datapoints of the same dimension as 'a'. % % x = (a*b'+t^2).^degree; % % see also: % RBF_kernel, lin_kernel, MLP_kernel, trainlssvm, simlssvm % % Copyright (c) 2002, KULeuven-ESAT-SCD, License & help @ http://www.esat.kuleuven.ac.be/sista/lssvmlab if length(d)>1, d=d(2); t=d(1); else d = d(1);t=1; end d = (abs(d)>=1)*abs(d)+(abs(d)<1); % >=1 !! x = zeros(size(b,1),1); for i=1:size(b,1), x(i,1) = (a*b(i,:)'+t^2).^d; end