Creating a histogram,

What command should I use to create a histogram of the data in x, with 7 bins that start on the 10's?

Answer 1

[David Hill]

Use histogram(), the matlab documentation is quite good.

https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.histogram.html

Answer 2

[Mattes Köppe]

To crate a Histogram use

histogram(x)

Since you want to specifiy the number of bins you can use

histogram(X,nbins)

In your case nbins would be 7.

The edges of the bins are choosen automatically depending on your inputvector x or u can specify them using

histogram(X,edges)

For more Information see Documentation.

Answer 3

[Image Analyst]

Try this:

% Create a hundred thousand values ranging from 0 - 1000.
numValues = 100000;
r = 1000 * rand(numValues, 1);
% Define bin edges on "10" boundaries, and get 7 bins:
edges = [0 : 10 : 70]
% Note: any x values beyond 70 will be totally ignored - they will not be lumped into the rightmost bin.
% If you want ALL the values, make the last bin inf
% edges = [0 : 10 : 70, inf]
h = histogram(r, edges)
% Let's see how many values got considered:
fprintf('The data has %d values.  This histogram has %d total counts in it.\n', ...
	numValues, sum(h.Values));
% Make the plot fancy:
grid on;
title('Histogram of x', 'FontSize', 18);
xlabel('x value', 'FontSize', 18);
ylabel('Counts', 'FontSize', 18);
ax = gca; % Get handle to current axes.
% Let's have the tick marks go outside the graph instead of poking inwards in to the bar.
ax.TickDir = 'out';