MATLAB: Assign values for the list of numbers in the column from a look up lable

Question

I have a table

x = [10; 20; 30; 40; 50;]; %look up table

and i have y =

1

4

5

and I want to assign 1=10; 4=40; 5=50;

and so if i have new values of y =

2

5

then I assign 2=20; 5=50;

Answer 1

x(y)