# Re: graphing software? (UNCLASSIFIED) ("Ewan A. Macpherson" )

```Subject: Re: graphing software? (UNCLASSIFIED)
From:    "Ewan A. Macpherson"  <ewan.macpherson@xxxxxxxx>
Date:    Thu, 19 Apr 2012 14:32:16 -0400
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

This would be straightforward to do in Matlab or Octave. Here's some
sample code:

% data
az =     [ -135 -90 -45  0 45 90 135 180];
az_err = [   15  20  15  5 15 20  15  10];
el_err = [   15  15  15  5 15 15  15  15];

% setup axes
axis square
set(gca,'xlim',[-100 100],'ylim',[-100 100])
hold on

% draw circle
r = 360/(2*pi);
x = r * cos( pi * (0:360)/180);
y = r * sin( pi * (0:360)/180);
plot(x,y);

% draw ellipses
for i = 1:length(az)
x_cent = r * cos( pi * (az(i)+90)/180);
y_cent = r * sin( pi * (az(i)+90)/180);
x = x_cent + az_err(i) * cos( (0:360) * pi/180);
y = y_cent + el_err(i) * sin( (0:360) * pi/180);
plot(x,y,'r')
end

Scharine, Angelique A CIV USARMY ARL (US) wrote, On 4/19/2012 1:58 PM:
> Classification: UNCLASSIFIED Caveats: NONE
>
> In this case a picture would be worth a thousand words - but I'll try
> to express this briefly.
>
> I would like to find a program that would allow me to create a graph
> of auditory localization error by plotting statistics representing
> azimuth and elevation error as an ellipse. The diagram would then be
> a circle representing a horizontal plane and error would be
> represented by the ellipses centered on the point on the circle
> representing that particular angle. Does this make sense? Does anyone
> know of such a program?
>
> I am a bit insane and obsessive and have figured out how to do this
> by hand using Photoshop, but it is time intensive. The results are
> gorgeous, but given the number of conditions for which I want to
> create graphs, it is impractical. Help? A.

--
Ewan A. Macpherson, Ph.D., Assistant Professor
School of Communication Sciences & Disorders
and National Centre for Audiology
University of Western Ontario, London, Ontario
519-661-2111 Ext 88072
```

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