# Creating a new column in a table which is true or false

2 views (last 30 days)
Luca on 6 May 2021
Commented: Luca on 9 May 2021
Hi,
I have to tables. One is called subsetx the other one is called subsety. In subsetx are two columns one is called ID and the other one SIC. It looks like this:
ID SIC
10000 3990
10000 3990
.
.
.
10001 4920
.
.
.
10002 6020
In subsety i have two rows with value 3990 4920.
I would like to create a new column in subsetx of logical type (true or false)
If variable SIC matches one of the numbers in subsety I would like to get a 1 if not i would like to get a 0.
The proble is you cant compare table with diffrent numbers of row.
I did attached the two subsets.
How can I solve this problem ?

Steven Lord on 6 May 2021
rng default
id = (1:10).';
SIC = randi(3, 10, 1);
t = table(id, SIC)
t = 10×2 table
id SIC __ ___ 1 3 2 3 3 1 4 3 5 2 6 1 7 1 8 2 9 3 10 3
t.is1or2 = ismember(t.SIC, [1 2])
t = 10×3 table
id SIC is1or2 __ ___ ______ 1 3 false 2 3 false 3 1 true 4 3 false 5 2 true 6 1 true 7 1 true 8 2 true 9 3 false 10 3 false
Luca on 9 May 2021
Thank you very much it worked.

David Fletcher on 6 May 2021
Edited: David Fletcher on 6 May 2021
vals=subsety{:,1};
subsetx{:,3}=subsetx.SIC==vals(2,1)|subsetx.SIC==vals(1,1);
Luca on 9 May 2021
Thank you it worked

R2021a

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