ictransf.m

来自「this a SVM toolbox,it is very useful for」· M 代码 · 共 30 行

function [alpha,theta]=ictransf(oalpha)
% ICTRANSF complementary trasformation to ctransf.
%  [alpha,theta]=ictransf(oalpha)
%
% ICTRANSF is a complementary function of CTRANSF.
%  Refer to CTRANSF for more description.
%
% Input:
%   oalpha [(N+1)x1] is a vector in transformed feature space.
%
% Output:
%   alpha [N,1] a column vector in the original feature space.
%   theta [1x1] a threshold in the original feature space.
%
% See also CTRANSF, HOMOG2.
%

% Statistical Pattern Recognition Toolbox, Vojtech Franc, Vaclav Hlavac
% (c) Czech Technical University Prague, http://cmp.felk.cvut.cz
% Written Vojtech Franc (diploma thesis) 11.4.2000
% Modifications
% 24. 6.00 V. Hlavac, comments polished.

% dimension
D=max(size(oalpha));

% transform alpha
alpha=oalpha(1:D-1);
theta=-oalpha(D);