How do I plot a gaussian mixed model with 1D data?

Question

Trisha Kibaya 2018-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/415429-how-do-i-plot-a-gaussian-mixed-model-with-1d-data

评论： Sajid Raza 2019-7-31

Hi I am a novice in Matlab. I have to plot a gaussian mixed model with one dimensional data. So far i have been able to do only this: data = xlsread('csf.xlsx','ab'); mu1 = mean('data'); sigma1 = std('data'); X = [mvnrnd(mu1,sigma1,1000)]; gm = fitgmdist(X,2); What do i do next? Thanks a lot.

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Sajid Raza 2019-7-31

@Trisha Kibaya, did you get answer for this one dimensional question?

I am facing same issue. I have one dimensional data. I use 'fitgmdist' to get gmdistribution. Then i want to visualize this distribution or show as clusters based on mu and sigma from the fitgmdist function.

Thanks.

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Answer 1

Yuvaraj Venkataswamy 2018-8-20

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/415429-how-do-i-plot-a-gaussian-mixed-model-with-1d-data#answer_333351

在 MATLAB Online 中打开

if true
  data = xlsread('csf.xlsx','ab'); % your data
  mu1 = mean('data'); % mean 
  sigma1 = std('data'); % standard deviation
  X = [mvnrnd(mu1,sigma1,1000)]; % generate equal number of random variables
  gm = fitgmdist(X,2); %Gaussian mixture distribution with 2 components
  scatter(X(:,1),X(:,2),10,'.')  % plot X
  hold on
  ezcontour(@(x,y)pdf(gm,[x y]),[-8 6],[-8 6])
end

From the plot You can visualize the fitted model gm by using pdf and ezcontour of your data.

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Trisha Kibaya 2018-8-20

Thanks for your reply. I did as you suggested and I got the following error message: Index in position 2 exceeds array bounds (must not exceed 1). Do you know which position its referring to? and is there a way to plot it like a bell curve?

Yuvaraj Venkataswamy 2018-8-20