Find the cell index in a nested cell array, corresponding to a string (by using strcmp)
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I have a 1×2 nested cell array A (cell array within a cell array):
A =
1×2 cell array
{43612×7 cell} {863892×7 cell}
where
A{1} =
{'Up' } {'Down' } {'Left' } {'Right'} {'BLUE'}
{'1' } {'7' } {'1' } {'8' } {'3' }
{'2' } {'7' } {'4' } {'3' } {'7' }
{'9' } {'1' } {'6' } {'2' } {'1' }
{'...' } {'...' } {'...' } {'...' } {'...' }
A{2} =
{'Up' } {'Down' } {'Left' } {'Right'} {'RED' }
{'2' } {'1' } {'1' } {'1' } {'2' }
{'6' } {'1' } {'7' } {'4' } {'2' }
{'5' } {'9' } {'8' } {'4' } {'4' }
{'...' } {'...' } {'...' } {'...' } {'...' }
If possible, by using only 1 or 2 lines of code, I would like to know if the text 'BLUE' is in A{1} or in A{2}.
The full answer would be: 'BLUE' is in A{1}(1,5), but I would like to know just the first index of A, i.e. either A{1} or A{2}.
Therefore, if we consider only the firs index of A, i.e. either A{1} or A{2}, my Result would be something like:
Result = 2x1 logical array
1
0
Which means my 'BLUE' text is in A{1}.
My first attempt started by using 'strcmp' in this way:
cellfun(@(x) strcmp(x, 'BLUE'), A, 'UniformOutput', false)
But then I got stuck... Any suggestion to get what I need in only 1 or 2 lines of code ?
Hope my question is clear enough.... Thanks a lot and best regards!
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Accepted Answer
More Answers (3)
Bruno Luong
on 16 Sep 2019
Edited: Bruno Luong
on 16 Sep 2019
A{1} = { ...
{'Up' } {'Down' } {'Left' } {'Right'} {'BLUE'}
{'1' } {'7' } {'1' } {'8' } {'3' }
{'2' } {'7' } {'4' } {'3' } {'7' }
{'9' } {'1' } {'6' } {'2' } {'1' }
{'...' } {'...' } {'...' } {'...' } {'...' }}
A{2} = {...
{'Up' } {'Down' } {'Left' } {'Right'} {'RED' }
{'2' } {'1' } {'1' } {'1' } {'2' }
{'6' } {'1' } {'7' } {'4' } {'2' }
{'5' } {'9' } {'8' } {'4' } {'4' }
{'...' } {'...' } {'...' } {'...' } {'...' }}
% testfun (ONELINE function)
% EDIT version
% returns 1 x 2 boolean arrays B, B(i) is TRUE if word exists in A{i}
testfun = @(word) ismember([0 1],find(strcmp([A{1}{:} A{2}{:}], word))>numel(A{1}));
testfun('BLUE')
testfun('RED')
testfun('Up')
testfun('YELLOW')
testfun('3')
testfun('5')
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the cyclist
on 16 Sep 2019
Edited: the cyclist
on 16 Sep 2019
Here is a one-liner:
cellfun(@(y)any(any(cellfun(@(x)isequal(x,{'BLUE'}),y))),A)
I stumbled across this function for dealing with nested cell arrays. I did not try it myself, but it could make this a bit more elegant-looking.
0 Comments
Sim
on 16 Sep 2019
5 Comments
Bruno Luong
on 16 Sep 2019
Edited: Bruno Luong
on 16 Sep 2019
Matt edit his code and correct the BUG, now his code runs about the same time as mine.
clear
createfun = @(s) arrayfun(@(x) {sprintf('%d',x)}, ceil(1000*rand(s)), 'unif',0);
A{1}=createfun([43612 7]);
A{2}=createfun([863892 7]);
% Matt J
tic
B = cellfun(@(x) strcmp([x{:}], '123'), A, 'UniformOutput', false);
matt_r = cellfun(@(c) any(c(:)), B);
toc % Elapsed time is 4.430430 seconds.
tic
testfun = @(word) ismember([0 1],find(strcmp([A{1}{:} A{2}{:}], word))>numel(A{1}));
bruno_r = testfun('123');
toc % Elapsed time is 3.967751 seconds.
% the cyclist
tic
cyclist_r = cellfun(@(y)any(any(cellfun(@(x)isequal(x,{'123'}),y))),A);
toc % Elapsed time is 22.860207 seconds.
Edit fix createfun BUG (forget inner {...})
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