2d histograms?

[etienne at isr.ist.utl.pt]

Quoting Søren Hauberg <soren at hauberg.org> (Fri, 09 Jan 2009 15:25:12 +0100):

> Hi All,
>   Does anybody have code to create 2 dimensional histograms that they
> are willing to share? I've found some code online, but it requires the
> 'histc' function which we don't have in Octave (yet).
>
> Søren

   Isn't it already in octave-forge (pkg plot, I think)?

   Hth,

   Etienne

octave:5> xy = randn (100,2)*[10 0;0 1]*[1 -1;1 1];
octave:6> [hh,xi,yi] = hist2d (xy)
hh =

     0    0    0    0    0    0    0    0    0    1
     0    0    0    0    0    0    0    0    0    0
     0    0    0    0    0    0    1    5    0    0
     0    0    0    0    0    0   12    0    0    0
     0    0    0    0    1    5    2    0    0    0
     0    0    0    2   18    4    0    0    0    0
     0    0    4   20    4    0    0    0    0    0
     0    2    5    1    0    0    0    0    0    0
     0    7    1    0    0    0    0    0    0    0
     5    0    0    0    0    0    0    0    0    0

xi =

   -22.3077  -17.0190  -11.7303   -6.4415   -1.1528    4.1359     
9.4246   14.7134   20.0021   25.2908

yi =

   -26.43426  -20.98045  -15.52664  -10.07283   -4.61902    0.83479     
6.28860   11.74241   17.19622   22.65003

octave:7> which hist2d
hist2d is the user-defined function from the file
/home/etienne/prog/octave/svn-octave-forge/octave-forge/main/plot/inst/hist2d.m

octave:8> version
ans = 3.0.3

### Note that my octave-forge is a little non-standard




-- 
http://www.isr.ist.utl.pt/~etienne

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