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specifying bin increments on a histogram

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John
John 2013-1-13
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');

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回答（2 个）

Walter Roberson
Walter Roberson 2013-1-13
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()
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the cyclist
the cyclist 2013-1-13
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 2013-1-13
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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