adding rows somewhere in the array

Hi all,

I record the location of an object in 2D-screen in this format:

LOCATION = [x, y, time(cpu time), frame number];

I would like to use the frame number in future analysis as an index. However sometime I notice that the frame numbers are skipped and nunot recorded. I mean when I calculate the diff(frame_num) I get ans>1.

I thought I could resolve this issue by finding the location of those frame numbers that missed. then produce frame numbers and replicate the corresponding row values from what I have in the vector.

ex.  frame_num = [1;2;3; 6;7;8; 15];

I find that I have no frame numbers between 3 and 6, and also between 8 and 15;

i want to create frame_num2 = [1; 2;3;4;5;6;7;8;9;10;11;12;13;14;15];

then for those frame numbers that I create I copy the corresponding values that I have. i.e. i copy the row of frame_number 3; for newly created frame_numbers 4 and 5.

Is there a way in matlab to find all the skipped frame numbers at once?

any idea?!

Thanks

Answer 1

[Brian B]

Then, when you want to build the complete LOCATION matrix, you can do something like

 LOCATION2 = zeros(15, 4);
 LOCATION2(:,1) = 1:15;
 LOCATION2(LOCATION(:,1),:) = LOCATION;

to put the known values into the new matrix. Then you just have to fill in the other parts of the inserted rows.

[tafteh]

great, allow me to try this out.

[tafteh]

thanks, it works. appreciate it

Answer 2

[Brian B]

Do you mean that you simply want to find which numbers are missing from frame_num? You can do that with

 missing_nums = setdiff(1:15, frame_num);