function y=sigmoid(X,arg1,arg2)% SIGMOID Evaluates sigmoid function.%% Synopsis:%  y = sigmoid(X,model)%  y = sigmois(X,A1,A2)%% Description:%  y = sigmoid(X,model) returns %     y = 1/(1+exp(A(1)*X + A(2))%%  where A = model.A.%%  y = sigmois(X, A1, A2) allows A to be given as A = [A1 A2].%% Input:%  X [1 x num_data] Inputs.%  model.A [2 x 1] Sigmoid parameters.%% Output:%  y [1 x num_data] Evaluated sigmoid function.%% See also %  MLSIGMOID.%% About: Statistical Pattern Recognition Toolbox% (C) 1999-2003, Written by Vojtech Franc and Vaclav Hlavac% <a href="http://www.cvut.cz">Czech Technical University Prague</a>% <a href="http://www.feld.cvut.cz">Faculty of Electrical Engineering</a>% <a href="http://cmp.felk.cvut.cz">Center for Machine Perception</a>% Modifications:% 3-jun-2004, VF% 8-may-2003, VFif nargin == 3,  y = 1./(1+exp(X*arg1 + arg2));else  model=c2s(arg1);  y = 1./(1+exp(X*model.A(1)+model.A(2)));endreturn;% EOF