How can I use the find function for cell arrays to search for particular cell vector values
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Suppose I have a cell array:
EC = {[1,2,1,1] [1,3,1,1] [1,4,1,1] [1,1,1,2]}
I need a way to index where the values of the cells = [1,3,1,1] or [1,1,1,2] such that MATLAB returns: [2,4] for the 2nd and 4th cells of array EC.
I've been trying to use the find function, but it doesn't appear you can use that for cell arrays...
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KSSV
2017년 3월 21일
EC = {[1,2,1,1] [1,3,1,1] [1,4,1,1] [1,1,1,2]} ;
k = {[1,3,1,1] [1,1,1,2]} ;
EC = cell2mat(EC(:)) ;
k = cell2mat(k(:)) ;
[val,idx] = ismember(k,EC,'rows') ;
idx
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Jan
2017년 3월 27일
편집: Jan
2017년 3월 27일
@Kevin: In the general case this command searchs if an element of A occurres in B:
[LIA, LocB] = ismember(A, B);
LIA is a logical index vector related to A (L I A), which is TRUE, if the corresponding element of A occurres in B, while LocB is the index of the matching element of B.
추가 답변 (1개)
John BG
2017년 3월 25일
hi Kevin
the following builds a 2 columns cell where 1st column is just the numeral coinciding with EC amount of elements and 2nd column is variable length indicating what vector of D matches the i-th element of D
EC = {[1,2,1,1] [1,3,1,1] [1,4,1,1] [1,1,1,2]}
D={[1,3,1,1] [1,1,1,2] }
match={}
for k=1:1:size(EC,2)
match{k,1}=k;
for s=1:1:size(D,2)
if isequal(class(D{s}),class(EC{k})) && isequal(EC{k},D{s})
match{k}=[match{k} s];
end
end
end
match{:}
ans =
1
ans =
2 1
ans =
3
ans =
4 2
this script can be enhanced to include EC and D containing different classes.
if you find these lines useful would you please mark my answer as Accepted Answer?
To any other reader, if you find this answer of any help please click on the thumbs-up vote link,
thanks in advance for time and attention
John BG
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