# Counting occurrence of keys and values for Containers.Map in another Containers.Map

5 views (last 30 days)
Ravindra on 18 Aug 2020
Commented: J. Alex Lee on 19 Aug 2020
How it is possible to count occurrence of keys and values of Containers.Map A in B?
A = containers.Map({1026,1033,1038,1042},...
{[605.914,48.521],[490.6086 23.7932],[257.558,67.625],[439.090,225.924]});
B = containers.Map({1025,1026,1028,1029,1031,1033,1035,1037,1038},...
{[397.494,168.066],[605.914,48.521],[295.712,176.770],[226.249,209.288],...
[52.573,278.126],[490.6086 23.7932],[50.747,213.198],[38.992,4.417],[257.558,67.625]});
Thank you!!

J. Alex Lee on 18 Aug 2020
Just considering the keys, you can use ismember (though I'm not sure why there's a limitation that cells must be cell arrays of character vectors, and can't be numbers..)
If you need to check if values are the same, you can iterate through the matched keys and use isequal()

Ravindra on 18 Aug 2020
Thank you Lee!!
The first two line works. The following command gives error :
Error using cell/ismember (line 34)
Input A of class cell and input B of class cell must be cell
arrays of character vectors, unless one is a character
vector.
I tried another way as well....
C = cell2mat(A.keys)
idx = find(cell2mat(B.keys)== C(1))
idx = find(cell2mat(B.keys)== C(2))
idx = find(cell2mat(B.keys)== C(4))
Thank you again!!
J. Alex Lee on 19 Aug 2020
Yes, sorry should have clarified the last line doesn't work, but seems like a silly limitation by TMW to me. Glad it helps!