Comparing columns and returning 0s for matching values

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
1      0
2      
3    `  
4      0
5      0

How could I accomplish this efficiently?

[Pablo Jaramillo Restrepo]

...(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
1      0
2      1
3    `  1
4      0
5      0

Answer 1

[Ingrid]

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

[Pablo Jaramillo Restrepo]

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

[Guillaume]

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));