Accessing data from nested cell array

Question

Durga Lal Shrestha 2016-11-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313593-accessing-data-from-nested-cell-array

评论： Sterling Baird 2020-7-3

I have the following nested cell array

values{1,1}{1,1} = '1_1';
values{1,1}{1,2} = '1_2';
values{1,2}{1,1} = '2_1';
values{1,2}{1,2} = '2_2';
values{1,3}{1,1} = '3_1';
values{1,3}{1,2} = '3_2';

I would like to access data as shown below:

for i=1:length(values)
     firstValues{i} = values{1,i}{1,1};
     secondValues{i} = values{1,i}{1,2};            
end

How can we access data without loop?

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Answer 1

KSSV 2016-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/313593-accessing-data-from-nested-cell-array#answer_244385

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   values{1,1}{1,1} = '1_1';
  values{1,1}{1,2} = '1_2';
  values{1,2}{1,1} = '2_1';
  values{1,2}{1,2} = '2_2';
  values{1,3}{1,1} = '3_1';
  values{1,3}{1,2} = '3_2';
firstvalues = cellfun(@(x) x{1}(:)', values, 'UniformOutput', false)
secondvalues = cellfun(@(x) x{2}(:)', values, 'UniformOutput', false)

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Durga Lal Shrestha 2016-11-23

Thanks KSSV.

Sterling Baird 2020-7-3

I suppose technically it's not a loop, but it should be noted that cellfun() and arrayfun() are typically somewhat slower than for loops. See https://www.mathworks.com/matlabcentral/answers/42335-array-cellfun-vs-for-loop

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