Merge several histogras into a one single plot

I'm having multiple histograms of several images. I need to merege them in to a one histogram plot. I have tried so many ways and there it didn't work. It will be greatful if anyone can give me a possible way to do this.

Answer 1

[mizuki]

You can get histogram plot information by gca (get current axis) of gcf (get current figure). Under Axis properties, Histogram properties are stored.

% make two sample set 
x1 = randn(100,1);
x2 = randn(100,1);

% draw the first histogram
figure(1)
histogram(x1);
h_f1 = gca;    % get axis properties
d1 = h_f1.Children.Data;  % get Data properties under Histogram property set

% draw the second histogram
figure(2)
histogram(x2);

h_f2 = gca;
d2 = h_f2.Children.Data;

figure(3)
histogram([d1 d2])

I am not sure if this is exactly what you wanted. For the next time, write what you have exactly tried so that others can figure out the problem instantly as well as you can get good answers.