How can I track the number of tracked mosquitoes in a given time bin?

I have processed 2D and 3D tracking data that I am trying to analyze. The post processed data files contain a matrix with a row for each tracked mosquito that contains the x, y, and z location as well as the time that the mosquito was tracked. I would like to calculate the number of tracked mosquitoes by converting each occurrence in time to 1 then adding up the tracks the fall within a given time bin. What would be the easiest way to accomplish this in a script?

[Image Analyst]

You might attach your data as well as an m-file to read it in. So does each plane in your 3D array correspond to one mosquito, and in each plane the rows are the time point that the location was taken, and the columns are the x, y, and z locations? So the 2D array is (N time points) by (3 locations)?

[Matthew DeGennaro]

Each row in the Objects array corresponds with a single tracked mosquito and the columns are the x, y, and z locations and time. The mosquito is being tracked by its coordinate position in time. The 2D data is similar but does not have the z component. I have attached an example of the 3D data I am trying to analyze.

Thanks for taking a look.

[Image Analyst]

OK, but where is the second time point for that mosquito #1? If it's not in row 2, then where is x2, y2, z2 (the locations at time point #2) stored for mosquito #1? You say it's not in row 2, so where is it???

[Matthew DeGennaro]

All of the time points for mosquito #1 are contained in Objects.time. For example if you double click the Objects.time row, all the of multiple times the mosquito was tracked will come up. Does that make sense?

[Image Analyst]

Not to me but hopefully it will to someone else. Good luck.