2-Dimensional Histogram

Accumulate and plot a 2d histogram matrix.

Description

function H = histo2D(D,[Xlo Xhi],Xn,[Ylo Yhi],Yn,Xlab,Ylab,Title)
 
2-Dimensional Histogram
(size(H) == [Yn Xn])
Counts number of points in the bins defined by -
X = linspace(Xlo,Xhi,Xn) and
Y = linspace(Ylo,Yhi,Yn)

Example:
Dx = 5*rand(100,1) ;
Dy = 10*rand(50,1) ;
D = [Dx,Dy] ;
H = histo2D(D,[0 5],10,[0 10],5, 'Xlabel','Ylabel','2d Histogram') ;

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
2D Histogram Matrix
This submission has inspired the following:
2D Histogram

• MATLAB release: MATLAB 7.0.4 (R14SP2)

[Jascha Sohl-Dickstein]

This is exactly what I was looking for. Thank you!

[Paulo L]

An example does not work.

[Ty Woo]

Exactly what I was looking for. Had to fix the code only a little.

[Ian Thorpe]

Works very well and is easy to modify for your own needs. I had to transpose X and Y in the dsearchn calls to get it to work.

[tudor t]

it's very slow, and it becomes a nuisance for large matrices -- it's almost an order of magnitude slower than the other hist2d, the one that uses histc; however, that one has a bug;

also, there's something funny with the plot, it seems it omits 1 row and 1 column...

anyway, it's easier to write than to debug so I wrote my own :-)

[Pearl]

 

[Aaron Swan]

MATLAB provides the function hist3 to generate bivariate histograms