strfind: how to set a cell for the pattern?

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pietro 2014-7-11

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编辑： Image Analyst 2014-7-12

采纳的回答： Image Analyst

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Hi all,

I need to set a cell as pattern for strfind without using a for. Here an example

a={'1','2','3'};
b={'1','2'};
c=strfind(a,b)
c=[1 1 [] ];

thanks

cheers

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Image Analyst 2014-7-11

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What about this case:

a={'1','2','3'};
b={'2','1'};

Do you consider that the 1 and the 2 are found/matched, or not? They are not in the same locations , but both are in both arrays.

pietro 2014-7-12

the output should be {[1],[1],[]}.

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Answer 1

Image Analyst 2014-7-12

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编辑：Image Analyst 2014-7-12

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Here is a simple, easy to understand way that will work:

clc; % Clear command window.
% Initialize variables.
a={'1','21','3'};
b={'2','1'};
% Initialize results.
% Let's use a simple numerical array rather than a cell array!
c = zeros(1, length(a));
% Scan each element of "a" for all the elements of "b".
for k = 1 : length(a)
  for colb = 1 : length(b)
    if ismember(b{colb}, a{k})
      c(k) = 1;
      break;
    end
  end
end
% Print out to command window.
c

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Answer 2

Jos (10584) 2014-7-11

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% implicit for with CELLFUN
c = cellfun(@(x) strfind(x,b), a, 'un', 0)

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pietro 2014-7-11

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Thanks for your reply. It doesn't work, I get the following error:

Error using cell/strfind (line 33)
If any of the input arguments are cell arrays, the first must be a cell array of
strings and the second must be a character array.
Error in @(x)strfind(x,b)

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Answer 3

Titus Edelhofer 2014-7-11

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Hi,

not exactly the same result but similar:

ismember(a, b)

Titus

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Answer 4

Chris E. 2014-7-11

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Hello! Well I think this answers your question, it does not have a for loop, however it uses "ismember" rather then 'strfind', but I think the output is the same as what you want.

a={'1','2','3'}
b={'1','2'}
val = ismember(a,b)
val(val == 0)=[]
c = val

Hope that helps!

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pietro 2014-7-11

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Unfortunately I cannot use ismember because it is not really equivalent to strfind since it works only when there is an exact match. I'm sorry for not being clearly enough, but it should work also with the following case: