side by side multiply histogram in matlab

Question

I would like to produce a plot like the following in matlab.

Or may be som

Answer 1

You can use bar(...) or hist(...) to get the results you want. Consider the following code with results shown below:

% Make some play data:
x = randn(100,3);
[y, b] = hist(x);

% You can plot on your own bar chart:
figure(82);
bar(b,y, 'grouped');
title('Grouped bar chart');

% Bust histogram will work here:
figure(44);
hist(x);
title('Histogram Automatically Grouping');

% Consider stack for the other type:
figure(83);
bar(b,y,'stacked');
title('Stacked bar chart');

If your data is different sizes and you want to do histograms you could choose bins yourself to force hist(...) results to be the same size then plot the results stacked up in a matrix, as in:

data1 = randn(100,1);       % data of one size
data2 = randn(25, 1);       % data of another size!

myBins = linspace(-3,3,10); % pick my own bin locations

% Hists will be the same size because we set the bin locations:
y1 = hist(data1, myBins);   
y2 = hist(data2, myBins);

% plot the results:
figure(3);
bar(myBins, [y1;y2]');
title('Mixed size result');

With the following results:

Answer 2

Doesn't hist already do the first one?

From help hist:

N = HIST(Y) bins the elements of Y into 10 equally spaced containers
and returns the number of elements in each container.  If Y is a
matrix, HIST works down the columns.

For the second look at help bar