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Re: 2d histograms?


From: etienne
Subject: Re: 2d histograms?
Date: Sat, 10 Jan 2009 14:10:09 -0800
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Quoting Søren Hauberg <address@hidden> (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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