I am using scripts written by someone else a long time ago (who has long since gone) and I'm having trouble getting them to do something which is probably quite simple.
I have data from some tracking software and I'm trying to plot the x and y coordinates, as you would do normally but I want to show where the object spent the most time in the form of a pcolor map (so red will signify lots of time spent in an area etc).
I have a matrix (4 x ~30000), rows 1 and 2 contain the x and y coordinates and row 4 contains time in ms (at a 20ms sampling rate I believe).
I am sure I will need to bin the data somehow but I'm not sure how to do this...
Ultimately I want to do the same with velocity (a pcolor map with red signifying 'high speed') but I thought I would tackle this problem first.
Thank you very much for any help,
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This is a 2-d histogram problem.
Here is a link to a MATLAB file Exchange file that should calculate a 2-d histogram for you.
This video might be good for you too. http://blogs.mathworks.com/videos/2010/01/22/advanced-making-a-2d-or-3d-histogram-to-visualize-data-density/