Compare the rows of two cell arrays?

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Ibro Tutic 2017-7-21

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回答： Ari 2017-7-21

Let's say we have two cell arrays, a and b. a={1, 2; 3, 4; 5, 6; 7, 8} and b={1, 2; 3, 4; 5, 6; 7, 8}. How would I go about comparing the two arrays such that each row is compared to make sure that each row in b only contains numbers from the same row of a. So for example, the a(1,:)={1, 2} and b(1,:)={1,2}. This is fine, however, if b(1,:)={4,2}, an error would popup. Also, using the example from above, if b(1,:)={1}, this would be fine also. Length doesn't matter as long as its not longer than the same row of a. Any ideas?

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Image Analyst 2017-7-21

Why are you using cells arrays for a and b instead of regular numerical arrays?

Also b(1:,:) is a 1 by 2 cell array - the first row of b - so it cannot be {1} since that is only one cell, not two cells like you'd need to have an entire row of b.

Ibro Tutic 2017-7-21

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Sorry, the cell arrays are used because they are inputs from (b is the inputs)

inputdlg

a is the cell array that comes from some data that is pulled from various files. the data comes in as strings and is stored as a cell array.

And I thought I might have made that mistake but I wasn't sure. I guess I just need to compare the number to make sure it still matches a number in a.

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Answer 1

Ari 2017-7-21

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It will be a good idea to convert the cell arrays to numeric matrices before doing the comparison. The following line of code will return a logical array with zeros in rows which do not satisfy your condition.

check = ismember(cell2mat(b), cell2mat(a), 'rows')