Unique dates and data, supplying values to all repeated dates in a matrix after indexing.

Hi. I have a matrix (A = 70 x 2) with unique date and temperature. Then I have an array of dates (B = 500 x 1) with several repetition that exactly match with the unique dates in the matrix (A). How do I index the repeated dates in B with A? From this, I'd like to make a new column in B containing the temperature from A (even if they're repeated)? I tried intersect, find, fun, etc even using for loops, but I can't seem to find the right function or workaround to do this. Any help would be appreciated.

[Mohammad Sami]

use ismember.

[logical_date_is_in_a, index_of_date_in_a] = ismember(date_col_in_b,date_col_in_a);

logical_date_is_in_a true if the date in B exist in A

index_of_date_in_a this would contain 0 if the date in B does not exist in A