how to plot a histogram of repeated values in a matrix?

I have a matrix like below.

X = [120 2 3 250 60; 4 5 6 120 250; 7 8 3 250 10]

I want to plot a histogram shows the number of times a value is repated in each columns for example in first 120 in repeated 2 times in this matrix 250 is repeated 3 times in this matrix. any solution ?

Answer 1

[Thorsten]

This computes how often each value occurs

 [a b c] = unique(X);
 [X(b) histc(c, 1:max(c))]

[Niki]

but my main question is to plot it not to print it.

[Thorsten]

I see. Try this:

 B = [X(b) histc(c, 1:max(c))];
 stem(B(:,2), 'Linewidth', 2, 'Marker', 'none')
 set(gca, 'XTickLabel', B(:,1))
 axis([0 size(B,1)+1 0 1.1*max(B(:,2))])
 box off