Comparing columns and returning 0s for matching values

Question

编辑： Guillaume 2016-2-8

I have two columns in two separate tables:

T1 - Col A      T2 - Col A
1      1
2      4
3    `  5
4      
5

I am looking to create in table 1 a column B containing zeros for those matching values between T1-colA and T2-colA.

The result will look like

T1 - Col A      T1 - Col B
    0
    
  `  
    0
    0

How could I accomplish this efficiently?

...(sorry I forgot something) and for those values not matching, return a value (FOR EXAMPLE 1) so the resulting table will look like:

T1 - Col A      T1 - Col B
    0
    1
  `  1
    0
    0

Answer 1

Ingrid 2016-2-8

is it a table that you have or an array? Have you looked into ismember to see if this does what you want?

doc ismember

Thank you Ingrid! this function works well for what I am doing!

Guillaume 2016-2-8

编辑：Guillaume 2016-2-8

Whether or not it is truly a table or just a plain array, the answer is the same. Use ismember:

%assuming tables
T1.colB = ismember(T1.colA, T2.colA);
%assuming matrices
T1(:, end+1) = ismember(T1(:, 1), T2(:, 1));