smoothing with Gaussian Kernel for loop problem

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KHOULOUD DABOUSSI 2022-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1853178-smoothing-with-gaussian-kernel-for-loop-problem

评论： Mathieu NOE 2022-11-22

im having a probelm with smoothing the data "ys" using gaussian kernel function everytime i run the for loop i recieve uhat = ys and kerf = 0 0 0 0 0 ... anyone can help me?

ns =length(ys);
nv =length(tv);
lambda = 0.05;
tv = (1:1:1000)';
for i = 1 : ns
    k=(tv-tv(i));
    kerf=exp(-k.*k/2*(lambda^2))/(sqrt(2*pi)*lambda);
    uhat(i)=sum(kerf.*ys(i))/sum(kerf);
end

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采纳的回答

Mathieu NOE 2022-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/1853178-smoothing-with-gaussian-kernel-for-loop-problem#answer_1103903

在 MATLAB Online 中打开

hello

try this

lambda = 0.05;
tv = (1:1:1000)';
nv =length(tv);
ys = sin(4*pi*tv./max(tv))+0.25*rand(nv,1);% dummy data
for i = 1 : nv
    k=(tv-tv(i));
    kerf=exp(-k.*k/2*(lambda^2))/(sqrt(2*pi)*lambda);
    uhat(i)=sum(kerf(:).*ys(:))/sum(kerf);
end
plot(tv,ys,tv,uhat);