Removing strings if found in multiple arrays

Question

I'm having trouble deleting a string that can be found in my two arrays.

I have 2 arrays:

array1 = 1 2 3 4 5 6 7 8 9 10 array2 = 1 5 7 8 3 2 

If a string is displayed in both arrays, I want to remove it from array1 (example [7,8] ). I tried this line of code below:

 array1( find(array1(:,1) == array2(:,1)) ,:) = []; 

but I get the following error message:

Usage error == Matrix measurements must match.

What is the right way to do this?

Answer 1

use ismember , for example, if your arrays are a and b :

 a(ismember(a,b,'rows'),:)=[]; 

must do the job.

Answer 2

setdiff is more direct and allows you to save the original array if necessary:

 setdiff(array1,array2,'rows','stable') 

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For reference, you can also use interect :

 [~,ia] = intersect(array1,array2,'rows'); array1(ia,:) = []; 

However, I would use setdiff .