how to index a cell array

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li yan
li yan 2018-5-23
评论： li yan 2018-5-23
Hi, I encountered a Matlab problem again. I want to access all struct field elements, which is an element of a cell array, at one time, not using loop. Such as:
s{1} = struct('ID',1,'other field',...);
s{2} = struct('ID',2,'other field',...);
I want to access all ID values in the cell s, I write the code like this:
IDs = [s{:}.ID];
This does not work, how to access all ID values not using for loop, please?
  2 个评论
Stephen23
Stephen23 2018-5-23
If you used just one non-scalar structure (rather than lots of scalar structure in a cell array) then the solution would be very simple:
S(1) = struct('ID',1,'other field',...);
S(2) = struct('ID',2,'other field',...);
[S.ID]
Simpler, more efficient code through better data design. Why make your code more complex than this?
li yan
li yan 2018-5-23
Thank for you answer.
I'm doing information fusion with matlab, the track numbers vary dynamic, a cell struct is convenient to store track information.

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采纳的回答

Ameer Hamza
Ameer Hamza 2018-5-23
You can do this in Two steps
temp = [s{:}];
allIDValues = [temp.ID];
  2 个评论
Stephen23
Stephen23 2018-5-23
Note that in Ameer Hamza's answer the first line of code converts your cell array of scalar structures into one non-scalar structure. If you had stored your data in a non-scalar structure in the first place, then you would not need this extra step.
li yan
li yan 2018-5-23
thank you for your answer. I will try it

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