# how to stack hist?

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davit petraasya on 30 Jun 2016
Commented: Star Strider on 15 Jul 2021
Does anyone knows how to stack 2 histogram. I have certain area data for 20 years. I am calculating yearly number of events by hist command. And also I have another area data for 20 years. Doing the same, calculating yearly number of events by hist command for the area also. Note for 2 data time the same, 1980-2000 in years.
Now I wanted 2 hist data stack. Is there any way to do it?
Thanks!
Stephen Licata on 23 Dec 2020
That is a very good and fun example - many thanks!
BTW, if you want a special color, like 'gray' (which does not have a Matlab shortcut symbol code), do this bar command
bar(binrng,counts2,'FaceColor', [0.75 0.75 0.75])
which is equivalent to this version using the RGB integer values:
bar(binrng,counts2,'FaceColor', [192 192 192]/255)

Star Strider on 30 Jun 2016
The hist function does not offer a 'stacked' option, but you can create the effect easily enough with the histc function and a bar plot.
Experiment with this to get the result you want with your data:
d1 = randi(9, 50, 1); % Create Data
d2 = randi(9, 50, 1); % Create Data
binrng = 1:9; % Create Bin Ranges
counts1 = histc(d1, binrng); % Histogram For ‘d1’
counts2 = histc(d2, binrng); % Histogram For ‘d2’
counts3 = counts1 + counts2; % Histogram Sum ‘d1’+‘d2’
figure(1)
bar(binrng, counts3, 'b')
hold on
bar(binrng, counts1, 'y')
hold off
legend('Data 1', 'Data 2')
The idea is straightforward: create histogram counts for both sets of data, add them, then use the bar plot to first plot the sum, then overplot with one of the others. That will create your stacked histogram plot.
Star Strider on 15 Jul 2021
That’s a bit ambiguous.
Perhaps:
v1 = randi(9,1,50);
v2 = randi(9,1,50);
v3 = randi(9,1,50);
v4 = randi(9,1,50);
v5 = randi(9,1,50);
v6 = randi(9,1,50);
vm = [v1; v2; v3; v4; v5; v6];
binrng = 1:9;
for k = 1:size(vm,1)
counts(k,:) = histc(vm(k,:), binrng);
end
figure
bar(binrng,counts,'stacked')
grid
Experiment, if necessary, to get different results.
.