MATLAB: How to filter a cell array filled with strings

arraycellextractfield namefilterMATLABstruct

Dear all,
I have a dataset with 576 cells [1×576] and all cells contain strings [1×1 struct]. These strings contain two colums (field, value), e. g.:
A01 = struct('a',1,'b',2,'c',0)
A02 = struct('a',0,'b',2,'c',1)
A03 = struct('a',2,'b',2,'c',0)
A04 = struct('a',0,'b',1,'c',1)
A05 = struct('a',1,'b',0,'c',2)
A = {A01,A02,A03,A04,A05}
How can I filter all cells with a specific field name and extract them (as example: how can I filter all structs with a=1 and save the b values in new array)?
Sincerely yours, Max

Best Answer

This will return a logical array the same size as 'A' where TRUE values indicate elements of A that meet the following requirements:
  • A{i} is a structure
  • A{i} contains a field named 'a'
  • The value of field 'a' is equal to 1
keyField = 'a'; 
keyValue = 1; 
idx = cellfun(@(s)isstruct(s) && any(strcmp(fieldnames(s),keyField)) && isequal(s.(keyField),keyValue), A)
To filter those structures from the cell array A, 
A(idx)
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