How to EFFICIENTLY extract different length of vector from a different cell container?

Question

balandong 2017-11-28

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/369632-how-to-efficiently-extract-different-length-of-vector-from-a-different-cell-container

编辑： Jos (10584) 2017-11-28

Dear all, the idea was to extract different length of vector from a different cell container as demonstrated at the code below. However, I wonder if we can achieve the same procedure using CELLFUN instead. I really appreciate for any tips.

Thanks in advance

Data_CELL = {randi(9, 10,1),randi(9, 6,1),randi(9, 12,1),randi(9, 12,1)};  
Extracttill=[4 4 10 9]';
ExtractedData=cell(4,1);
 for f_x=1:4
     data=Data_CELL{1,:};
     ExtrcFUntl=Extracttill(f_x,1);
     ExtractedData{f_x,1}=data(1:ExtrcFUntl,:);
 end

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KSSV 2017-11-28

Note that Cellfun also uses for loop inside.

balandong 2017-11-28

Thanks for the heads up. However, using CELLFUN make the overall code more compact, although I think it may consume the processing time.

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Answer 1

Jos (10584) 2017-11-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/369632-how-to-efficiently-extract-different-length-of-vector-from-a-different-cell-container#answer_293554

编辑：Jos (10584) 2017-11-28

在 MATLAB Online 中打开

Here is a "hidden-loop / one-liner":

Data_CELL = {randi(9, 10,1),randi(9, 6,1),randi(9, 12,1),randi(9, 12,1)};  
Extracttill=[4 4 10 9]'; 
endExtractedData = arrayfun(@(k)  Data_CELL{k}(1:Extracttill(k)),1:numel(Data_CELL),'un',0)

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balandong 2017-11-28

Hi Jos, Thanks for the quick reply and awesome solution. Really appreciate it.

Btw, what do you mean by Do you not want to extract the values from 1 until a specific value, rather than a single value?. Your solution above does answer my original question actually.