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clc; clear; close all; x1=[0 0 1 1]; x2=[0 1 0 1]; t=[0 1 1 0]; v=[0.2 0.4;0.3 0.1; 0.7 0.8]; w=[0.5 0.5 0.5]; bh1=0.2; bh2=0.6; bh3=0.3; bo1=0.1; eta=0.4; E=0; for N=1:10000 for i=1:4 uh1=x1(i)*v(1,1)+x2(i)*v(1,2)+bh1; uh2=x1(i)*v(2,1)+x2(i)*v(2,2)+bh1; uh3=x1(i)*v(3,1)+x2(i)*v(3,2)+bh1; y1=1/(1+exp(-uh1)); y2=1/(1+exp(-uh2)); y3=1/(1+exp(-uh3)); uo1=y1*w(1,1)+y2*w(1,2)+y3*w(1,3)+1*bo1; o(i)=1/(1+exp(-uo1)); E=E+0.5*(t(i)-o(i)).^2; deltao1=(t(i)-o(i))*o(i)*(1-o(i)); w(1,1)=w(1,1)+eta*deltao1*y1; w(1,2)=w(1,2)+eta*deltao1*y2; w(1,3)=w(1,3)+eta*deltao1*y3; bo1=bo1+eta*deltao1*1; deltah1=y1*(1-y1)*(deltao1*w(1,1)); deltah2=y2*(1-y2)*(deltao1*w(1,2)); deltah3=y3*(1-y3)*(deltao1*w(1,3)); % input weight updation v(1,1)=v(1,1)+eta*deltah1*x1(i); v(1,2)=v(1,2)+eta*deltah1*x2(i); v(2,1)=v(2,1)+eta*deltah2*x1(i); v(2,2)=v(2,2)+eta*deltah2*x2(i); v(3,1)=v(3,1)+eta*deltah3*x1(i); v(3,2)=v(3,2)+eta*deltah3*x2(i); bh1=bh1+eta*deltah1*1; bh2=bh2+eta*deltah2*1; bh3=bh3+eta*deltah3*1; end plot(N,E); hold on; E=0; end