MATLAB: Find elements in one array not in another

ismemberMATLAB

I have

 a=1 3 5 6
 b=2 4 3 7

I need to find first_set=1 5 6 second_set=2 4 7

I tried

 p=ismember(a,b);
 first_set=a(~p)
 q=ismember(b,a);
 second_set=b(~q)

is there an easier way to do this?

Best Answer

try setdiff

 doc setdiff

% in above case

 first_Set=setdiff(a,b)
 second_set=setdiff(b,a)

Related Solutions

MATLAB: Finding mismatched elements ~ismember

q = setdiff(A,B,'rows')

MATLAB: Strcmp help

Like Fangjun said, ismember(),intersect() or setdiff() may be useful.

% Make a cell array of 10 short strings
firstSet = cellstr(char(randi(26,10,4)+96));
% And a second array using some of the first set mixed with other randoms
secondSet = cat(1, firstSet([2,7,9]), cellstr(char(randi(26,10,4)+96)));
% Randomise the order of this second set
secondSet = secondSet(randperm(length(secondSet)));
% Find matches
[firstMatch, firstMatchLocs] = ismember(firstSet,secondSet);
cell2print = cat(1, firstSet(firstMatch)', num2cell([find(firstMatch)'; firstMatchLocs(firstMatch)']));
fprintf('(%s), found at first index %d matches second index %d\n', cell2print{:})
fprintf('The following firstSet entries did not match the secondSet:\n')
cell2print = cat(1, firstSet(~firstMatch)', num2cell(find(~firstMatch)'));
fprintf('(%s) at index %d\n', cell2print{:})

Best Answer

Related Solutions

MATLAB: Finding mismatched elements ~ismember

MATLAB: Strcmp help

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