get common position in cell array and replace with specific values

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Elysi Cochin
Elysi Cochin 2019-3-20
编辑： Jan 2019-3-21
idx = [ 3 6 7 ] ;
ids = [ 2 3 5 6 7 ] ;
i have a cell of size 1 x 8
Initially all values in cell_array of size 1 x 8 is 'AB'
i want, the value in cell_array positions [3 6 7] (which is common in both idx and ids) to be wriiten as 'A' and the other values not in idx as 'B'
and those positions not in idx or ids, leave as it is (in our case 'AB')

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Jan
Jan 2019-3-20
编辑：Jan 2019-3-21
C = repmat({'AB'}, 1, 8);
idx = [ 3 6 7 ] ;
ids = [ 2 3 5 6 7 ] ;
index = intersect(ids, idx);
C(index) = {'A'};
index = setdiff(ids, idx);
C(index) = {'B'};
Or leaner:
m = ismember(ids, idx);
C(ids(m)) = {'A'};
C(ids(~m)) = {'B'};
Or:
Pool = {'B', 'A'};
C(ids) = Pool(ismember(ids, idx) + 1)

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