MATLAB: Manipulate a method contain to compare two lists

cell arraysgraphmatrix manipulationvector

l have trouble with the code below. l want to compare two lists of elements to : 1)know wether the neighbours of j are included in k 2)know wether the set of j is equal to k

but matlab returns me an error

    if (contains(neighbour_n{k}, neighbour_n{j})||(neighbour_n{j}==neighbour_n{k}));

Undefined function or method 'contains' for input arguments of type 'double'.

Best Answer

contains is not a standard matlab function. You can test set membership wih ismember. it'll return a vector of [true, false] values, so if you just want a scalar, yo need to use all.

Similarly, == returns a vector of [true, false] and only works if both matrices / vectors being compared are the same size. To test that two (sorted) sets are identical you'd use |isequal

Thus,

if all(ismember(neighbour_n{j}, set_n{k})) && isequal(set_n{j}, set_n{k})
    %do something

Related Solutions

MATLAB: Inversion of a boolean matrix

WRONG AGAIN

In testing Walter's suggestion about row and column sums I realized that isInvBool2 is wrong. Try B = [true true; false false]. The column sums are correct but the row sums are not. Here is my third attempt, which I hope is correct. It can be speeded up but I'm more interested in correctness than speed at the moment.

% --------------------------------------------------------------

  function answ = isInvBool3(B)
% --------------------------------------------------------------
% If the boolean matrix B is  invertible it must be a permutation
% matrix. Hence this check reduces to: Is B a permutation matrix?
% This is done by counting the number of TRUE values in each row
% and column. A permutation matrix has one TRUE value in each row
% and column.
% Derek O'Connor 24 Feb 2012. derekroconnor@eircom.net
    [n,n] = size(B);
    rowsum = zeros(1,n);
    colsum = zeros(1,n);
    answ = true;
    for i = 1:n
        for j = 1:n
            if B(i,j)
                rowsum(i) = rowsum(i)+1;
                colsum(j) = colsum(j)+1;
            end %if
        end %for j
    end %for i
    for k = 1:n
        if rowsum(k) ~= 1 || colsum(k) ~= 1
            answ = false;
            return
        end
    end
  % End isInvBool3

MATLAB: Cell contents reference from a non-cell array object.

the answer is :

neighbour_n{i}= setdiff(neighbour_n{i},F);

problem solved

Best Answer

Related Solutions

MATLAB: Inversion of a boolean matrix

MATLAB: Cell contents reference from a non-cell array object.

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