Find the index of nonempty array in a structure for a particular field

Question

naman 2015-7-23

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https://ww2.mathworks.cn/matlabcentral/answers/230930-find-the-index-of-nonempty-array-in-a-structure-for-a-particular-field

评论： Ali A. Ghafari 2020-1-10

Hi I have a structure with one field e.g. select(i).c, where i=1,...,N. I want to find the index i for which select(i).c is nonempty. How can I do it ? Thanks

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Cedric 2015-7-23

select is a struct array actually. Do you need the index of the non-empty content or would the content be enough? And what is the type/class of what is stored in field c?

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Answer 1

Andrei Bobrov 2015-7-23

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https://ww2.mathworks.cn/matlabcentral/answers/230930-find-the-index-of-nonempty-array-in-a-structure-for-a-particular-field#answer_186955

编辑：Andrei Bobrov 2015-7-23

在 MATLAB Online 中打开

find(~cellfun(@isempty,{select.c}))

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Ali A. Ghafari 2020-1-10

thanks

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Answer 2

Jos (10584) 2015-7-23

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https://ww2.mathworks.cn/matlabcentral/answers/230930-find-the-index-of-nonempty-array-in-a-structure-for-a-particular-field#answer_186954

编辑：Jos (10584) 2015-7-23

在 MATLAB Online 中打开

use ARRAYFUN

% create some data
for j=1:10, select(j).c = repmat(j,round(rand(1))) ; end
% engine
tf = arrayfun(@(k) ~isempty(select(k).c), 1:numel(select))
idx = find(tf)