creation of a histogram with RGB values (in .txt file)

I would like to obtain the histogram in the figure below with the RGB values present in the .txt file.

In the .txt file.: The first column is Red. The second column is Green. The third column is Blue.

How can I do it?

Answer 1

[KSSV]

data = importdata('filename.txt') ;
h1 = histogram(data(:,1), 10);
h1 = h1.Values ; 
h2 = histogram(data(:,2), 10);
h2 = h2.Values ; 
h3 = histogram(data(:,3), 10);
h3 = h3.Values ; 

clf
figure(1)
set(gca,'color','k')
hold on
bar(1:10, h1,'r')
bar(11:20, h2,'g')
bar(21:30, h3, 'b')