Convert Cell to Struct

I'm trying to access contents of a cell array which has 4 structures.

 celldisp(tracks_array);

gives output:

 tracks_array{1} =

                 kalmanFilter: [1×1 vision.KalmanFilter]
                           id: 0
            totalVisibleCount: 1
                         bbox: [390 171 70 39]
    consecutiveInvisibleCount: 0
                          age: 1

 tracks_array{2} =

                 kalmanFilter: [1×1 vision.KalmanFilter]
                           id: 1
            totalVisibleCount: 1
                         bbox: [459 175 40 24]
    consecutiveInvisibleCount: 0
                          age: 1

 tracks_array{3} =

                 kalmanFilter: [1×1 vision.KalmanFilter]
                           id: 2
            totalVisibleCount: 1
                         bbox: [220 156 159 91]
    consecutiveInvisibleCount: 0
                          age: 1

 tracks_array{4} =

                 kalmanFilter: [1×1 vision.KalmanFilter]
                           id: 3
            totalVisibleCount: 1
                         bbox: [510 159 68 49]
    consecutiveInvisibleCount: 0
                          age: 1

Then I Use a for loop to iterate through the elements..

 for elmen = tracks_array
     structtt=cell2struct(elmen(1),{'id','bbox','kalmanFilter','age','totalVisibleCount','consecutiveInvisibleCount'},2);

This gives error of

 Error using cell2struct
 Number of field names must match number of fields in new structure.

Then I used this inside the for loop

 disp(elmen)
 celldisp(elmen)

gives,

[1×1 struct]

 elmen{1} =

                 kalmanFilter: [1×1 vision.KalmanFilter]
            totalVisibleCount: 1
                         bbox: [390 171 70 39]
    consecutiveInvisibleCount: 0
                           id: 0
                          age: 1

I want to access the elements by their field names. How do I do this?

Right now if I try:

 elmen.id

or

 getfield(elmen,'id')

gives error

 Struct contents reference from a non-struct array object.

Answer 1

[Andrei Bobrov]

structtt = cat(1,tracks_array{:});

[Anand CU]

 This worked! thank you so much..
But I want to understand what that does?

[Stephen23]

@Anand CU: read these:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

[Anand CU]

Thank You..

Answer 2

[Massimo Zanetti]

https://it.mathworks.com/help/matlab/matlab_prog/access-data-in-a-structure-array.html

[Anand CU]

i get Struct contents reference from a non-struct array object. error