I have data workspace 1x617struc 1 field, every row has 1x1 struc with 4 fields, How can I extract the 4th field of data for 617? thanks

no

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

Answer 1

[Walter Roberson]

{YourStruct.NameOf4thField}

A cell array is needed because the 4th field is not guaranteed to be consistent size or data type.

In the case where the 4th field is a numeric row vector of consistent size, then

   vertcat(YourStruct.NameOf4thField)

would give you a 617 x something numeric array

[Ni Putu Dewi Nurmalasari]

Hi Robert, I tried but it doesn't work. exp a 1x617 struct 1 field" and every row consists of 1x1 struct 4 field and the 4th field example b[1xn]. So I expect to get all of b value for 617 rows. thanks

[Walter Roberson]

Example,

for K = 1 : 10
  example(K) = struct('field1', struct('field1_4', randi(10,1, randi(5))));
end

arrayfun(@(S) S.field1.field1_4, example, 'uniform', 0)

In the special case where the entries are scalar values, you can omit the 'uniform', 0 option

[Ni Putu Dewi Nurmalasari]

</matlabcentral/answers/uploaded_files/63030/data.jpg> Hi Robert, I cannot quite figure out the code that works. so i post the data i have, the 4th data always has 1 column but the row is changing. Thanks a lot

[Ni Putu Dewi Nurmalasari]