How to analyze the distance?

[sunmi...@gmail.com]

Hi,

I am using the ctrax software. It is so powerful. But I have a question. How to analyze the total distance of flies? which script can I use?

Thanks! 

[John Bender]

Hi Sunming,

What distance exactly are you asking about? Do you mean the total
distance walked by each fly during a video, or the distances between
flies, or something else?

JB

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[sunmi...@gmail.com]

Hi JB,

I mean that total distance walked by each fly during a video.

Thanks!

Mingkuan

在 2013年11月5日星期二UTC-5下午6时01分24秒，John Bender写道：

[John Bender]

Hi Mingkuan,

It's pretty straightforward. Use the load_tracks script to load the
data from a .mat file, then write your own short script to calculate
the distance traveled by each fly. Something like this:

trx = load_tracks;
n_flies = length( trx );
distances_walked = zeros( 1, n_flies );
for fly = 1:n_flies
dX = sqrt( diff( trx(fly).x ).^2 + diff( trx(fly).y ).^2 ); % Pythagoras
distances_walked(fly) = sum( dX );
end


JB

[sunmi...@gmail.com]

Hi JB,

Now I can analyze the total walked distance. Whether or not can we analyze the flies social behaviour using the software? So, I have a new question, How to analyze the distance between flies? Which script can I use?

在 2013年11月6日星期三UTC+8下午3时28分05秒，John Bender写道：

[John Bender]

Hi Mingkuan,

The compute_perframe_stats_social script in the BehavioralMicroarray
Toolbox does exactly that:
http://ctrax.sourceforge.net/bmat.html#compute-perframe-stats-social-m

JB