How to insert fieldname character type into struct type?

Question

Sam 2018-11-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430849-how-to-insert-fieldname-character-type-into-struct-type

编辑： per isakson 2018-11-19

采纳的回答： per isakson

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Hello,

This is my code:

load('Cal_Lags.mat'); %
% there are 4 treatments. Treatment 1 consists of 30 subjects.
fn = fieldnames(Cal_Lags.Treatment1); 
...
% I want to replace "Pig158320817" with data in fn    
output = zIO_treatment1.Lag158320817(:,1) ...
       + mIO_treatment1.Lag158320817(1)   ; 

fn is a vector of 30 x 1 cell. I select the first cell with k = fn{1, 1}. Now k is character-type. I want to make a forloop to immediately calculate the output for all 30 subjects, using the 'character' in fn, the problem is I can't seemed to incorporate fn{1,1} and select the first column...

Thank you.

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Rik 2018-11-19

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You mean like this?

output=0;
for n=1:numel(fn)
    temp=zIO_treatment1.(fn{n});
    output=output+temp(:,1);
    temp=mIO_treatment1.(fn{n});
    output=output+temp(1);
end

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Answer 1

per isakson 2018-11-19

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430849-how-to-insert-fieldname-character-type-into-struct-type#answer_347898

编辑：per isakson 2018-11-19

在 MATLAB Online 中打开

A tiny experiment

>> s.f = {1,2,3,4,5,6,7};
>> name = 'f';
>> s.(name)(6)
ans =
  1×1 cell array
    {[6]}
>> 

I'm guessing. Try something like this

len = length( fn );
output = cell( len, 1 );
for jj = 1 : len
    output{jj} = zIO_treatment1.(fn{jj})(:,1) ...
               + mIO_treatment1.(fn{jj})(1)   ; 
end