non-looping way to compare cellstr arrays of different sizes

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David Goldsmith 2011-8-24

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Suppose A = {'aa', 'kk', 'ccc'}, B = {'aa', 'bb', 'cc', 'dd', 'ee'}.

Is there a not-explicitly-looping way to return a logical array the same size as A that is 1 where an element of A is in B, 0 where it is not, e.g.,

"whereMember"(A,B) => [1 0 0]?

Thanks!

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Oleg Komarov 2011-8-24

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A = {'aa', 'kk', 'ccc'};
B = {'aa', 'bb', 'cc', 'dd', 'ee'};
ismember(A,B)

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David Goldsmith 2011-8-24

DOH! again. (But shouldn't that be ismember(lower(A),lower(B)) - I want it to be "commutatively" case insensitive.) :-)

Thanks one more time!

Oleg Komarov 2011-8-24

Yes, then lower() both.

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David Goldsmith 2011-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/14470-non-looping-way-to-compare-cellstr-arrays-of-different-sizes#answer_19649

在 MATLAB Online 中打开

Here's a little function that does if the answer to the revised question is "no":

function la = cellstrIsMember(A, B, i)
  % la = 1 where the elements of cellstr array A are in cellstr array B, 0 where they are not
  % i is an optional parameter: if case matters, i=1 (the default), 
  %     0 for case-insensitive matching (which is slower)
  %
  % Author: David Goldsmith, Wash. State Dept. of Ecology, dgol461@ecy.wa.gov
  % Release date: 2011-08-24
    if nargin < 3
        i = 1;
    end
    if i || isempty(A) || isempty(B)
        la = ismember(A, B);
    else
        la = zeros(size(A));
        for i=1:length(A)
            if any(strcmpi(A{i}, B))
                la(i) = 1;
            end
        end
    end
end

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David Goldsmith 2011-8-25

Jan: may I credit you in my by-line comment? If yes, what is your affiliation, if any?

Jan 2011-8-25

@David: I've tried to let leo.org tell me, what affiliation is. Leo meant, that either somebody adopts me, or that it concerns my fatherhood. :-) If this means my company: I'm a freelancer. Perhaps my FEX author ID 15233 is helpful?

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