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Plotting gaussian on histograms

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Kash022
Kash022 2016-11-2
回答： Tian Tian 2017-8-4
I have a hist distribution as shown. I now want to plot gaussians on top of this proportional to the number of occurences as shown. I am using the below code snippet to generate the histograms and then trying to plot the gaussians for each. The final output should look like a gaussian mixture which I am not getting. Please help! Thanks!
figure(3); subplot(1,5,1); clear x,y; [x,y] = hist(HW(1,:),[0:4]); stem(y,x); /* HW is a 16x16 matrix */
/**** for plotting gaussians ****/
x=[0:0.25:4];
for kk = 1:16
norm = pdf('Normal',x,HW(1,kk),0.25); /* my mean should be HW(1,kk) with sigma=0.25 */
plot(x,norm);hold on;
end

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回答（2 个）

Steven Lord
Steven Lord 2016-11-2
Rather than calling hist, call histogram and tell it to use 'pdf' Normalization.
% Create histogram from sample data A
A = repelem(0:4, [1 4 6 4 1]);
h = histogram(A, 'Normalization', 'pdf');
% Customize Y axis tick location and labels
ax = ancestor(h, 'axes');
ax.YTick = (0:6)./16;
ax.YTickLabel = {'0/16', '1/16', '2/16', '3/16', '4/16', '5/16', '6/16'};
  2 个评论
Kash022
Kash022 2016-11-3
It does not plot the gaussian mixture. Simply the histograms have been plotted which I don't need. I just need to see the gaussian pdfs overlapping with one another for given mu and sigma.
Kash022
Kash022 2016-11-3
I have tried using the normpdf as shown below but do not get any output.
A = repelem(0:4, [1 4 6 4 1]);
for i = 1:size(A,2)
norm(i) = normpdf(A(i),HW(1,i),0.25);
plot(A(i),norm(i));
end

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Tian Tian
Tian Tian 2017-8-4
Hi Kash022,was your problem get solved? I also need to apply Gaussian filter to a histogram plot and find smoothed peaks. Could you please give me some ideas on applying Gaussian filter? Which code did you use? Many thanks. Tian

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