How to efficiently: Access and store row of cell value

Question

balandong 2017-5-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/338612-how-to-efficiently-access-and-store-row-of-cell-value

编辑： KSSV 2017-5-4

Dear Coder, The objective was to access value in a row of cell and transfer it to other structure. Is there other efficient way than using for loop as shown below.

   for i = 1:2650
  feature_set (i,1) = Patient.sub_band{i, 1}.feature; end

Thanks in advance for the insight.

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Answer 1

KSSV 2017-5-4

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/338612-how-to-efficiently-access-and-store-row-of-cell-value#answer_265557

在 MATLAB Online 中打开

Are you looking for something like this?

%%create a radnom sturcutre
for i = 1:2650
    Patient.sub_band{i, 1}.feature = rand; 
end
% Now extract 
all_features = [Patient.sub_band{:}] ;
 feature_set = [all_features(:).feature] ;

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KSSV 2017-5-4

编辑：KSSV 2017-5-4

balandong Commented:

Dear KSVV, thanks for the proposed technique, indeed it is efficient then the for loop. For example, the time taken to process the data using FOR-LOOP and your-approach is 0.01050 sec and 0.00650 sec, respectively. In addition, your line is more tidy if the more DOT FEATURES are to be processess.

Thank you

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