Compare the rows of two cell arrays?

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Ibro Tutic
Ibro Tutic 2017-7-21
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
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
Ibro Tutic 2017-7-21
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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Ari
Ari 2017-7-21
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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