?? exr4.m
字號:
st1=cputime;
x1=1:0.3:5;
x2=1:0.3:5;
[X1,X2]=meshgrid(x1,x2);
X=[];
[m,n]=size(X1);
for i=1:m;
for j=1:n;
X=[X;X1(i,j),X2(i,j)];
end
end
Yd=(1+(X1).^(-2)+(X2).^(-1.5)).^2;
Y=(1+(X(:,1)).^(-2)+(X(:,2)).^(-1.5)).^2;
global p1
p1=1.2;
ker='rbf';
[nsv, beta, bias] = svr(X,Y,ker);
%svrplot(X,Y,ker,beta,bias)
mx=size(X,1);
x1t=2:0.151:5;
x2t=2:0.151:5;
[X1t,X2t]=meshgrid(x1t,x2t);
Xt=[];
[mt,nt]=size(X1t);
for i=1:mt;
for j=1:nt;
Xt=[Xt;X1t(i,j),X2t(i,j)];
end
end
Yt = svroutput(X,Xt,ker,beta,bias);
Ytd=(1+(X1t).^(-2)+(X2t).^(-1.5)).^2;
k=size(Yt,1);
for i=mt:-1:1
for j=nt:-1:1
Ys(i,j)=Yt(k);
k=k-1;
end
end
figure(2)
mesh(X1,X2,Yd)
figure(3)
mesh(X1t,X2t,Ys);
figure(4)
mesh(X1t,X2t,Ytd);
DY=Ys-Ytd;
ERR=sum(sum((DY).^2))./mt./nt
T=cputime-st1
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