CODEWITHSUNDEEP
matlabvector
bzak
bzak

Reputation: 563

Matlab: How to know if a vector V belongs to a set S?

How to know if a vector V belongs to a set S?

V=[3 7 5]

S={[1 3],[4 9 7 22 4 5],[2 66 4],[8 66 44 12 5 71],[100 45 88 7 1 5 9 73]}

Upvotes: 0

Views: 160

Answers (3)

Divakar
Divakar

Reputation: 221574

Problem case #1: Assuming you want to find if for each cell in S, there is at least one element that is also present in V, you can use this arrayfun based approach -

out = arrayfun(@(n) any(ismember(S{n},V)),1:numel(S))

For the given inputs, you would get -

>> out
out =
     1     1     0     1     1

Or cellfun based approach (though I would bet my money on arrayfun based approach for better performance) -

out = cellfun(@(x) any(ismember(x,V)),S)

Problem case #2: If you are looking for exact match between V and each cell of S, you can again use arrayfun -

out = arrayfun(@(n) isequal(V,S{n}),1:numel(S))

Upvotes: 2

Rash
Rash

Reputation: 4336

You can use cellfun,

 A = cellfun( @(x) isequal(x,V), S );

or 

A = cellfun(@isequal,S,repmat({V},size(S)));

will give,

A =
 0     0     0     0     0

and sum(A) > 0 will give final results.

Upvotes: 3

SIMEL
SIMEL

Reputation: 8941

You need to go over each vector in the set and check if it's the same as the vector V:

for i=1:length(S)
    if (isequal(S{i},V))
        % V is in S
    end;
end;

Take notice that you address S with curly brackets {} to get the value of the cell and not the cell itself.

Upvotes: 1

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