Plot multiple histogram within 1 function

Question

MadjeKoe 2020-10-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/613811-plot-multiple-histogram-within-1-function

编辑： Adam Danz 2020-10-15

Hi all! I made some histograms, but now I'm trying to make a function that plots multiple histograms at the same time. I want 1 plot with 4 overlapping histograms of different colors and a legend. Can someone please explain to me how to do this? I tried to make a loop (see bottom) but it doesn't seem to work.

histogram_color = [0 .7 .7];
histogram(error1,'normalization','pdf','edgecolor',histogram_color,'facecolor',histogram_color,'facealpha',.5)
x = -90:1:90;
f1 = fitdist(error1,'kernel');
pdf1 = pdf(f1,x);
l1 = line(x,pdf1,'linestyle','-','color',histogram_color,'linewidth',3);
histogram_color = [0 0 .7];
histogram(error2,'normalization','pdf','edgecolor',histogram_color,'facecolor',histogram_color,'facealpha',.5)
x = -90:1:90;
f2 = fitdist(error2,'kernel');
pdf2 = pdf(f2,x);
l2 = line(x,pdf2,'linestyle','-','color',histogram_color,'linewidth',3);
x = -90:1:90;
for i = 1:length(out)
histogram(out(i),'normalization','pdf','edgecolor',histogram_color,'facecolor',histogram_color,'facealpha',.5);
f(i) = fitdist(out(i),'kernel');
pdf(i) = pdf(f(i),x);
l(i) = line(x,pdf(i),'linestyle','-','color',histogram_color,'linewidth',3);
end

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Adam Danz 2020-10-14

You're missing "hold on"

Otherwise the 2nd histogram replaces the first.

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Answer 1

Sudhakar Shinde 2020-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/613811-plot-multiple-histogram-within-1-function#answer_514453

在 MATLAB Online 中打开

[~,ErrorLength]= size(out);
for i =1:ErrorLength
    hold on
    histogram(out(:,i),'normalization','pdf')
    hold off
end

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Answer 2

Steven Lord 2020-10-14

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The "Plot Multiple Histograms" example on the documentation page shows how to superimpose two histogram plots using hold on.

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Answer 3

MadjeKoe 2020-10-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/613811-plot-multiple-histogram-within-1-function#answer_514403

simulated_serial_bias_dataset.mat

S = load('/Users/mkoenraad/Desktop/Scriptie/exercise_2/simulated_serial_bias_dataset.mat');

res = S.res;

targets = res(:,7);

responses = res(:,8);

orx = [3,4,5,6];

tgt = [1,2,3,4];

num = numel(orx);

out = cell(1,num);

for k = 1:num

idx = targets==tgt(k);

resp = responses(idx);

ori = res(idx,orx(k));

err = resp - ori;

err(err<-90) = err(err<-90)+180;

err(err>90) = err(err>90)-180;

out{k} = err;

end

out = [out{:}];

ero1 = out(:,1);

ero2 = out(:,2);

ero3 = out(:,3);

ero4 = out(:,4);

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Adam Danz 2020-10-15

在 MATLAB Online 中打开

You only need to "hold on" once and that was mentioned in a comment under the question 13 hours prior to this sub-thread.

hold on %                   <---  Move here
[~,ErrorLength]= size(out);
for i =1:ErrorLength
    % hold on               <--- Remove 
    histogram(out(:,i),'normalization','pdf')
    % hold off              <--- remove or move out of the loop
end

Adam Danz 2020-10-15

编辑：Adam Danz 2020-10-15

"I did not work."

I doubt it. It's the same solution as Sudhakar Shinde's and you indicated that it worked. There must have been some other problem (which is likely given the new propblem follwing "clear all").

" I tried 'clear all' & now my whole thing is not working anymore"

'clear all' is rarely necessary. You likely were using a global variable named x and now it's no longer defined. If that's the case, it s a good lesson to never use global variables. Now you need to figure out where x was defined.

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