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Compare the rows of two cell arrays?

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Ibro Tutic
Ibro Tutic on 21 Jul 2017
Answered: Ari on 21 Jul 2017
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
Image Analyst on 21 Jul 2017
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
Ibro Tutic on 21 Jul 2017
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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Answers (1)

Ari
Ari on 21 Jul 2017
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')

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