specifying bin increments on a histogram

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John
John on 13 Jan 2013
Hello,
I use the code below to create a plots like this with different data sets. I want all plots to have the same scale, i.e. 0 to 90 and -2 to +2.
Not all data sets have data values at the extreme ends of the scales around 80-90 or 1.8-2 for example.
For example if the data in data set only ranges from 0-75 does the code divide the data up into bin intervals of 75/90 or does it create bins in 1 mph increments so bins 76-90 would have no data?
My question is, how can you specify that you want 90 bins a 1 mph increments and you want 40 bins at 0.1 increments from -2 to +2?
load Data;
% Calculate histogram
nBinsX = 120;
nBinsY = 40;
hist3(Data,[nBinsX,nBinsY]);
% Plot histogram
set(gcf,'renderer','opengl');
s = get(gca,'child');
zData = get(s,'zData');
colormap gray;
set(s,...
'zData' ,zData/length(Data),... % normalize frequency
'FaceColor' ,'interp',...
'EdgeColor' ,0.3*[1 1 1],... % make edges visible at all heights
'CDataMode' ,'auto'); % color tops according to height
% Labels
title('Velocity VS Acceleration Distribution');
xlabel('Velocity (mph)');
ylabel('Acceleration (m/s^2)');
zlabel('Normalized Frequency');

Answers (2)

Walter Roberson
Walter Roberson on 13 Jan 2013
If you want specific bins, then pass in the list of bin centers if you are using hist(), or pass in the list of bin edges if you are using histc()
  1 Comment
the cyclist
the cyclist on 13 Jan 2013
Note that John is using hist3(), which is just a bit different in syntax from hist() and histc().

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the cyclist
the cyclist on 13 Jan 2013
I suggest you make a careful read of
>> doc hist3
There is a section near the top that describes exactly how to specify either the bin centers or edges that you want.
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